I played this game as a child. Still log on occasionally, but I don't play seriously. I collect unicorns and breed them, so I sometimes do weird things in sales in two ways:

1. I sell a bunch of foals for less than market value (3-4k): I'm clearing out my not unicorn foals. I'm selling them for cheap to get rid of them fast. I'm not interested in reserving them unless you're offering 5k or more equus per foal.

2. I bid on fancy horses in auctions long before the auction is over: I'm artificially lowering my reserve to cover my unicorns. If you let the auction alone for 10-15 minutes before outbidding me it'd make my day much easier.

Don't ask to buy my horses please - if I'm selling they're for sale.