"Or you can look at"
You do realize your data is from now and mine is from 2013? Also, your data makes my point. The enterprise you reference is less profitable per corp, so his enterprise tax is somewhat less.
"Lol my Enterprise tax dropped to 105B this month. Almost 1/2 last month"
No, your tax was $107B just the other game month. If this expense jumps in one month, you probably moved or purchased a corp, which also uses that same finance line. At the number of corps you have with the approx. profitability you are currently getting, you are seeing a fairly consistent tax of somewhere between $100-115B.
"What is in your 'Depreciation' portion of your calculation? Just the quality and efficiency upgrades? or is there something else?"
After "profits" there are several expenses that corporations still pay. These are country taxes, loan interest, and upgrades. For this reason, If you see some $900B at the bottom of your enterprise financial sheet as "profit", that is not the amount of cash your corporations actually net, and will never end up being a comparable amount shared with your enterprise through profit sharing.
For public corps, some amount of their reported profit you don't even own. ie. If you control a corp with 25% ownership, that corp may report $1B monthly profit to your enterprise stat sheet, but you only own $250M of that "profit".
In the case of upgrades, you could consider their purchase an investment, building the value of the corp. However, over time, upgrades decay. This is why you still see mature corps purchase upgrades and have pending upgrade purchases. This depreciation is a corporation expense that exists and is difficult to see.
To disprove my point, you would need to find an enterprise that performs better as a result of having more corps. The one you posted is in line what I am telling you. There is no way out. If you run your enterprise less profitable, your tax will go down, sure, but it still will exist, and you don't do yourself favors to outperform the enterprise under the cap. If you achieve better profits, the greedy enterprise tax will have its hand out for more spoils.
Here is how I would ballpark top WG enterprises for the most recent game month. I an estimating an average of 30% tax and some amount for depreciation.
Enterprise A
Corps: 744
"Profit": 1,363.51B
Enterprise Tax: 0
Net Profit: around $820B
Enterprise B
Corps: 1093
"Profit": 948.62B SC$
Enterprise Tax: 75.9B
Net Profit: around $490B
Enterprise C
Corps: 858
"Profit": 883.27B SC
Enterprise Tax: 103.80B
Net Profit: around $425B
All this data backs what I have been telling you. If you exceed 750 corps, you will get hit over the head with more tax if you are more profitable per corp. On the other hand, if you are less profitable per corp, you will have less tax, but, again, you won't be outperforming anyone.
Edit: Remember again, for these stats, if you have public corps, you don't own all the "net profit".