???ME
As I've said before, I find the concept of a holy person unable to bear their god's symbol as purely illogical, leading me to the conclusion that VoP as written is deeply flawed.
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Imagine a layman meeting a being of great power (the ascetic) allegedly aligned to St. Cuthbert, but who loses that power upon grasping St. Cuthbert's symbol. To the layman, that would look like St. Cuthbert is punishing the ascetic for touching the symbol...much like how such a symbol would burn a vampire. It makes the ascetic look like a liar.
FTDM
Your argument sounds reasonable for a Neutral good god, or a LG or CG god that favors good.
I chose St. Cuthbert at random- it could have been any god or philosophy that would satisfy the VoP- so don't get into the particulars of one god vs another. I'm talking in general terms here.
So, you're going to have to explain this again...why would ANY god or divine force grant a set of abilities to his most faithful followers that would preclude those followers from carrying the symbol of that god or divine force?
It is a common trope in religions and legends that those opposed to {fill in the blank deity} cannot handle the symbols or holy objects or read the scriptures of {fill in the blank deity}. To attempt such results in loss of power by/damage to/destruction of the being not aligned with {fill in the blank deity}.
And this holds true across ethoi- a priest who handles an unholy book devoted to {fill in the blank EVIL deity} would be just as sickened as a cultist handling a holy book devoted to {fill in the blank GOOD deity}.
And this is EXACTLY what happens when an ascetic handles the holy symbol of his own faith. Despite his claims of supreme devotion to {fill in the blank deity}, use of {fill in the blank deity's} holy symbol renders him powerless. Forever. Instead of looking like the most blessed of {fill in the blank deity's} followers, he looks like {fill in the blank deity's}enemy.
Well as as been pointed several times the VoP is a role-playing tool for "mature" gamers.
Which does nothing about resolving the internal inconsistency.
Alternatively, the problem could be overcome with an exalted feat (VOP characters get bonus exalted feats anyway) that worked like Eschew Materials.
Or a house rule that says that someone with Sacred Vow no longer needs a holy symbol- the power of the vow itself acts as a direct channel to the divine force to whom the vow is sworn, and when needed, a holy symbol simply manifests...