Stuff I'm too lazy to farm.
If I need a few more heirlooms upgraded, I'll spend it on that too.. Other than that, pretty much stuff I want NOW!
And I sell mats and pets I get through my playthroughs.
Right now I fluctuate around 300k... more than enough to help me, for I already have the mounts I want and have no desire to spend millions on a dumb chicken...