Let's see:
White Polar Bear Mounts (F RNG!)- ~40k
Blue Drake Mount (again, F RNG!)- ~35k
PVP Bracers for alt- 20k
Brawler's Guild Invite- ~10k
So, about 100k give or take a bit. I bid around 250k on Onyxian Drake once, and was initially really bummed out I lost. Then it dropped the next week for free! =D