If you pick up VoP - as a player - you do it for the bonuses, of course.
But as a character, you do not. You don't make a vow of poverty, because you want cool abilities.
You willingly sacrifice material wealth to gain purity and rid yourself of thoughts of greed. You do so in order to seek enlightenment, which - nicely enough - is granted to you in the form of various, powerful bonuses and special abilities.
The sacrifice comes first, the rest follows, not the other way around.
If a player does not roleplay a character like that, but rather with the mindset, that the vow of poverty is the cost to gain all those cool abilities, then he or she will lose their powers pretty fast IMC. Intentionally circumventing the vow is the same as breaking it IMHO.
Bye
Thanee