I was caught on the right side of a bidding war a few years ago - I put my scooter up for sale - Perfectly good, though big miles yet well maintained. Similar age bikes had gone for about £600 - £700, I'd have been chuffed with £500. Went for £1300! - way way way over the value. Both bidders had been to see the bike before the auction, and just got into a bidding war. The winning bidder turned up next day with cash. No grumbles.