Interesting tidbit of the moment that seemed to have been overlooked in the initial overview/write up.
The expected Wealth of Character value is assuming that some measure of the character's wealth will be depleted through advancement gameplay (important when doing the Level 20 Comparisons).
The traditional, Same EL encounter should exhaust 1/4 of party resources (party resources refer more broadly to hitpoints and spells in addition to expendable resources) would place the relative level of balance at a much closer viewpoint.
Also lacking liquidity isn't a good situation for a 'Standard' Adventuring party (especially one that may be faced with having to shell out 20,000+ gp for True Resurrection). Just as the inability to use potions yourself which only becomes significant in a combat situation, as any other time, the other party members may 'chip' in their healing stock.
At a glance, I noticed on numerical falacy, there should be 11 feats mentioned (assuming human), however, you do need to account for the fact that you're spending 2 feats specifically to obtain those 11 feats. Also, interestingly enough, the human (VoP) gains 3 more feats than the non-human (VoP) in this situation, as the bonus feat at 2nd is unobtainable as well. Vow of Povetry isn't selectable as a fighter bonus feat, so it's kinda hard/impossible to take the Vow at 2nd.
There's also the whole 'Exalted' requirement, which is greatly minor, I just didn't see it mentioned

.
And honestly, it's only really 'power viable' for monks, sorcerers, or wizards (if your DM is nice about spellbooks).
I dislike Vow of Povetry for its idea myself. I dislike the mechanic of a feat being less powerful (on a 'point level') if you take it later in your career. However it is necessary given the nature of the feat. I may be willing to play with it myself or allow another player to for testing if the opportunity presents itself.