That's really interesting. Perhaps people feel they are getting a better deal if they 'win' (buy) something at $20 that someone else wanted for $19. But if you

That's really interesting. Perhaps people feel they are getting a better deal if they 'win' (buy) something at $20 that someone else wanted for $19. But if you had of just listed it at $20, then they feel that the seller is just trying to extract as much value as they possibly can. That is - they are getting the market value rather than the arbitrary value the seller assigns. Even if that value ends up being the same.