Do you think it's right for Plato's Closet to make you keep the price sticker on the insoles of a pair of shoes even if you have the receipt

Of course not a sticker can easily be replaced but store reputation and inconvenience of customer cannot be replaced so easily. If it was my store I would go out of my way to make it as painless as possible.

While I take no postal objection to your question oil to the remarks made I would suggest the question is off topic

No

It's proof you haven't worn them a lot