Right now, we actually do have a shop system, but the main form of currency there is gil rather than points. It's kind of hard to explain, but basically, you can set up your shop however you like, which means you could have a shop that specializes entirely in sigtags if you so desire.

But the thing about sigtags is that currently they don't get points in moogle_workshop... This might change next game but as it is right now, you'd be able to fill other people's requests and post your work in moogle_workshop, but they wouldn't get your team any game points. (You would gain gil, though.)

Does that make sense? Basically, we already have a shop system that you can use if to offer sigtags to people. However, we currently don't have a points system worked out for sigtags, but this is something that can be changed starting next game.