I was playing a level 12 vow of poverty monk recently. As I said in the power analysis thread, it really is not overpowering compared to a smart player who can spend his gold freely. Still, it sure is fun to have a halo on your character's head!
Does Forsaker-Vow of Poverty make a whole lot of sense? As far as I remember, Forsaker is more about disdaining and destroying magic than giving all of your money to the poor.
Ao- that might be overpowered, but you could have had 2 feats and 760,000 gp instead of both vow of poverty bonuses and say, +5 inherent bonuses to 3 stats. However, it makes no sense for a character to search out nothing but inherent bonuses for 18 levels. If you limited him to say, half of his wealth in inherent bonuses for those 18 levels, it would probably be fine.