Cheating and RMT exploitation has hit a new level of ridiculous.

[Kes13a]

And how exactly would they know who buys gil? The transaction usually happens ingame, and there are legit ways to trade gil by getting gil from someone else - e.g.: I can give my friend gil as a loan to buy a house. Or I want to give gil to a newly married couple. Etc...

well, if you believe that they have no way to track gil, then more power to you. companies do it now, they have done it in the past. there is no reason SE cannot do it through their database, even ingame, so no need for spy software in the program. sure, you can lend gil, or give gil to newlyweds, which is an easily justifiable way to do it as well as easily proven. since it is just as easily provable how you earned it. there is a record.