I typically profit 15k-25k per character( i use craftstore's gold tracker) a day after normal expenses without any trading or buying stuff off traders. I have two characters so 30k-50k a day before trading. I sell 10 times more than i buy from from traders, so it could be over 500k. TBH i really dont keep that close of track.
200-300k on average I would say. The bigger question is, how much do I spend... haha
I have gone through phases where it was quite a bit more than that, but when your bank account and craft bag are both in the 8 figure value range, I just dont see the point. At this point, I do writs and that keeps me flush with everything I need to play the game with plenty to spare.
It varies if I don't play much and just do writs on 1 character I can make 28k. So probably I do around a hundred or so. Don't keep up with it very much.