I used to play the Auction House in WoW, and traded a bunch in Eve. Economic PvP can be a lot of fun, plus getting virtually rich is nice. That was many years ago though. Recently, SWTOREconomics (aka Andrew) posted an article about cornering a market which rekindled my interest in the GTN. So I started to look around a bit. I'm a bit too risk adverse for his methods.
I've fallen into bad habits. I basically rely on the Cartel Market for credits. I don't buy much except for Stronghold decorations, some of which can be pretty expensive. So I'll buy a pack and toss it on on the GTN. Can easily earn credits that way. It does suck though and still feels like 'cheating.' It's just so easy and takes very little time. I'd much rather earn them through in-game means though.
I'd like to use crafting as a means for credits, but have not been having much luck. The margins just seem to be so small. That means it'll take a lot of time, which I'd rather spend playing. I used to make good money crafting Barrels for use during leveling, but 12xp has made that a less viable strategy. The end-game components require high-end group content (grrr).
I refuse to do dailies. So, I'll keep poking around to see if I can find a good market to get into. I'm not the brightest bulb when it comes to money making opportunities.