People should really stop mentioning selling stuff on the markets in a thread about gil fountains, that's just moving around the gil generated by those fountains and only slightly related to the topic. The game does have gil fountains though, at least more than on release, it's not much but should be enough for repairs and transportation. Treasure hunts and dailies are fast to complete, dungeon gil depends on how much you want to run them over and over vs going for better gear rewards from other content.

Besides with housing destroying market prices and succeeding with SE's vision of slashing 1/10 of the gil again everything is way cheaper, so if you ever do decide to touch the market boards it should be enough for most purchases anyway.