I don't think any user would really want to do that without a big reward - so your efforts might just be a waste of time.

My question; why don't you ask one of your family members or friends to verify their ID for you for the same reward? Don't you think it's a smart choice instead of expecting someone online to sell their ID at risk?

If someone really wants to sell ID and verify it - then I hope they actually have to call escrow to handle the payment. But this is a risky move even though most of them are users of centralized exchanges.