Well until you get to them raids.... You can make yourself some gear. Or make stuff and sell on MB. Or make intermediate HQ items (yeah I an not saying that right, take the base gathering item, make it into an HQ item that is then used to make something else) and sell it on MB. Make gear, SB, sell the Materia. Plus leveling up a crafter (and / or gatherer!) will give you that option to make one of your retainers one of them. Which, in turn could give you some nice items, or minions, or what have you.

If you did want to do Weaver, you may want to do Botanist as well, depending on how much effort you want to do. I am not far in my crafting, but you gather a lot of your base cloth items with Botanist, so you could be self-sustaining in that manner.