What we want to achieve, is to make expansion at more than 500 trading ships an investment that pays back less when compared to a naked (no infrastructure) plantation with reasonable permission/rental costs.
If we look to the top 10 plantations in terms of production per acre, we will get the following:
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- #      Owner   Size   Production
 per Acre (Units)
 1   New Land   Feniks (#65591)   Large   107
 2   Psaral   Banger (#67360)   Large   104
 3   Psaral   Noffin (#53779)   Mega   102
 4   Thorakas   william one eye (#58369)   Large   82
 5   Goroum   Noffin (#53779)   Large   77
 6   Goroum   Feniks (#65591)   Normal   77
 7   Baramas   Astragek (#66222)   Oversized   76
 8   Goroum   Jim Hawkins (#14972)   Large   70
 9   Vaasburg   Jim Hawkins (#14972)   Oversized   68
 10   Chalkos   Lodswe (#35322)   Oversized   63
It is still too early and we expect this figures to improve considerably. It plays a great role whether you have excess acres on this stat. Feniks is pulling 77 on a normal sized plantation for example and 107 at a large size production. Surely, this new ranking category will help you all determine what to improve and get the most out of every acre.
Another decisive factor is how many workers you employ to other infrastructure and whether or not the acres applied there are well distributed. 
Finally, it is important to underline that laborers can take a large portion of production early on if you are using them in mass to speed construction. At our profitability measurement, we do not want to include their cost as this falls into another category; the profitability of a developed plantation.
We will focus here for profitability on plantations with no infrastructure, to get to the point we want.
So,we need to beat 250 days ROI for certain. Then perhaps compete a bit with real profit as well. All the stats we will use, will be based from the stats you have managed to produce early on at this 2 weeks that plantations have been with us. This is the fair way to go forward as this feature at some point will be a case for newcomers too.
So, our top 10 stats right now signify that the average top production per acre, is  83 units per acre. This generates 83 * 7 = 581 gc per day. A 1000 acres plantation, as a result, will generate 581k of income per day, on these metrics.
What we now need to get, is how many fleets are needed to keep the needed workers to produce these, when health and morale is at 0%. An average as many other things matter.
To get this, we will have a look at deaths yesterday versus units production. From the top producing ones, only 2 had casualties yesterday and this makes them candidates for our metrics:
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- Astragek 76.4 units, 188,645 casualties
 Jim Hawkins 68.1 units, 41,553 casualties
 
If we check top casualties instead, we get these:
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- Owner   Units   Casualties
 The Accountant   122,510   252,082
 Astragek   267,432   188,645
 Black Sparrow   78,052   162,212
 Caladan   56,777   123,865
 xXMontyXx   21,386   117,029
 Caladan   52,060   103,802
 Kangaroo   59,729   95,394
 The Accountant   96,201   94,009
 Kangaroo   68,900   77,756
 Adam Smith   54,530   70,937
 
Before we analyze the data above, let's estimate capacity per 5xLMM fleet per day.
That's 600*2*12 = 14.4k immigrants per fleet
At a cost of 22k to 68k 
Income generated: Crates Produced * 7
Fleets required: Casualties/14.4k
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- Owner   Total Income   FleetsRequired
 The Accountant   857,570   17
 Astragek   1,872,024   13
 Black Sparrow   546,364   11
 Caladan   397,439   8
 xXMontyXx   149,702   8
 Caladan   364,420   7
 Kangaroo   418,103   6
 The Accountant   673,407   6.5
 Kangaroo   482,300   5
 Adam Smith   381,710   5
 
If we want to calculate actual plantation profit based on fleets required for those above, then we get this table:
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- Owner   Profit
 Astragek   142,899
 The Accountant   103,150
 Kangaroo   89,319
 Adam Smith   77,486
 Kangaroo   63,114
 Caladan   50,554
 The Accountant   48,988
 Black Sparrow   48,502
 Caladan   46,205
 xXMontyXx   18,420
 
The tables above, signify the maximum, currently available, profit per fleet without calculating the other half of the journey for the fleet.
Now, if we add 22k to each fleet, that they should definitely be making at the very least, then we can see the following:
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- Astragek   164,899
 The Accountant   125,150
 Kangaroo   111,319
 Adam Smith   99,486
 Kangaroo   85,114
 Caladan   72,554
 The Accountant   70,988
 Black Sparrow   70,502
 Caladan   68,205
 xXMontyXx   40,420
 
I am not saying that any of the above is making this profit yet though, as we do not know how many fleets they actually employ and what kind of fleets these are. However, the metrics above show how many fleets they need to maintain current profitability. There are surely rooms for improvement.
Remember, these are not the best case scenarios. We just took the top 10 plantations with most casualties. I am assuming that these plantations have already reached 0 health and 0 morale and most , if not all, are using workers for improving infrastructure.
The examples above do not include improvement costs - these are not of our concern anyway as we do not want to calculated developed plantations profitability (which should be great anyway, as it will be mostly passive).
We do not include operation/rental costs (these will be dictated by players. We only need to provide more metrics to everyone involved to allow you to calculate easier what you want to spend to compete).
We do not include upkeep costs - but these should be near 0 anyway as most of your workers will work at the fields.
We not include initial construction permission cost. These should zero with time though as they are permanent so it would not be prudent to include them. With current credits value, its around 20M which is not a big figure for anyone running 20+ fleets.
We are mostly comparing plantation income versus trade income based on initial investment.