Quote Originally Posted by Felis View Post
Or standard at 300k gil, gold at 4m gil and platinum at 15m gil as an alternative.
It's easier to charge real money than in game currency.

1) It's real money that they can use for other things.
2) Not everyone has the Gil to purchase any level.
3) Games are now targeting the casual gamers who don't have the time to farm dungeons for hours everyday. Or manipulate the market board and rake in millions of gil a day but have disposable real currency to get what they need or want.