Introducing methods that generate gil (not exchange) is tricky. RMT... I don't think I need to say anything more about them. You'd be taking a big gamble by allowing a flow of gil to be quickly/easily generated. In the case of RMT, we're not talking one character/account here, we're talking dozens, if not hundreds or more, per server. Beyond that, would the market be able to handle such things? Would new players be able to afford some reasonable upgrades when it comes to an inevitable inflation? How much of a strain to the servers would it be for X method of gil generation to be done by a large scale of players?

Leves, namely combat ones, definitely need to be looked at again. The combat rewards, particularly exp related, is just... bad. At least when compared to doing FATEs. The crafting related leves though are a different matter. They're actually decent gil generation. Not so much for an NQ turn in, but an HQ one is very good. The higher your craft is, the more gil you generate. 500-1k gil (or more) per HQ turn in, for just ONE leve, is significant at this point in time.