@Roland
I think you have a valid point with somewhat invalid logic. You took a 'worst case scenario' to a bit too much of an extreme, imho.
I can also argue that REXing two cities 20 tiles away from the capital on Deity will increase maintenance to a ridiculous level capable of ending any game before it starts.
Does that mean city maintenance is broke? No ... it just means don't REX like that.
Likewise, I can easily show you how a size 28 Deity city housing 4 foreign corporations consuming 27 resources under Environmentalism with 300% inflation can cause serious detriment to any economy.
(I can then show you how with one Corporate Office founding and a Civics change its possible to reduce the corporations by 50% and the raw corporate fees by 50%. I can then show you how there is probably still a competing Corporation you can found to help replace foreign corps with your own domestic corps. Or, I'll show you how conquering the HQ city can also solve your problems

)
I find myself wondering how plausible that situation is and how many people will be foolish enough (especially Deity players) to get themselves in that kind of situation.
However, you have a valid point, and I see where you're going with that. Given certain situations, it is possible for a foreign civ to inadvertently (or maybe even intentionally) tank your economy with a few ill-placed Corporate Offices.
So, I'll contend it is certainly possible either the fees or the inflation are wrong.
I'll also contend they are right. I don't really care for espionage (read: terrorism), however, it has been designed as an integral component of BtS and therefore must be followed and utilized. It may also be the same case with Corporations -- that we must either accept the rules as they lie or be ground to dust under Corporate fees.
... but I digress back into a debate I really never intended to enter (see below).
@Flak
In short, I don't doubt the abilities of any of the programmers & modders in this community. I've seen some ridiculously good stuff come out.
But I also know none of that stuff came out overnight. How long after the release of Warlords did BetterAI come out?
In the end, no matter how good our deductive reasoning is ... no matter how good our programming abilities ... if we were not part of either the design or testing team, then we ultimately do not know what Firaxis' true intent was for Corporate Fees and Inflation.
Again, I'm not saying I'm right. I'm not saying I'm wrong. I'm not saying Firaxis is right. I'm not saying you're wrong. I'm not really saying anybody is right or wrong.
@all
Somehow, I have found myself arguing in favour of a game mechanic I ultimately don't support or reject.
The original intent of my post was merely to shed light on Corporate Maintenance (not so much Inflation) and very briefly how to utilize the current system for gain and to make the most out of Corporations.
My nature is to accept the mechanic just as it is and to make the most of it, which is why I don't bat an eye when somebody talks about the high costs of Corporations or Inflation. Instead, I have chosen to accept the model and play within its bounds.
In the midst of it, though, I got caught up and was sucked into arguing the validity of the current model and whether or not it's wrong or should be changed.
Quite honestly, I don't care. I'll continue (ab)using the current system to the best of my abilities until whatever patch may come -- at which point I'll re-evaluate the game mechanics and post whatever I find.
My ultimate goal is only to help explain the Corporate Maintenance mechanics and formulas -- not to argue whether it's right or not.
So, on that note, I'm not going to debate who's right, who's wrong or who has the credentials to critique the system and when they're allowed to critique it.
Win, Lose or Draw, the system is what it is right now, and I'm not going to let it keep me from getting my money's worth.