Excellent point. But I suspect most people wouldn't be entirely honest with their payment and would infact, consciously or not, factor this in. So they would st

Excellent point. But I suspect most people wouldn't be entirely honest with their payment and would infact, consciously or not, factor this in. So they would still pay slightly less than they actually value the product so they still feel like they're getting a good deal too. I.E; paying $4.50 for a sandwich when, if pushed, they would have paid $5. Certainly nobody would over-pay...surely?