I've made around 110 million currently, been around on and off since launch, although I haven't made a concerted effort to make money until last year. About 90% of that is from the GTN. Don't raid or pvp. Mostly in the game for story and the galactic economy now.
Quite enjoying myself tbh.
Buying and selling cartel market items is pretty lucrative, but you have to be patient and persistent. I've branched out into resource trading a little bit, but I just generally don't have the time for that. And the market for resource trading has changed since RotHC.