1. Player evaluations. You see how many managers/what quality of managers are willing to bid up to X amount of dollars for a player. Better than just going by price estimate feature.
2. League mates. You see what kind of skill sets teams in your league/division/another countries equal division are bidding for.
3. Ability to report cheaters. People who bid $1k then $10k then $100k then $1m on a scrub player for no reason (when nobody else is bidding).
4. Reselling value. The player just sold for say $500k. Is now being sold 2 weeks later for $500k. Was it one manager just bidding $500k out of the blue or was it a bidding war up to $500k? Indicates if the player is worth the $500k or you can wait until he lowers the price.
5. Time of day. You can see when a lot of bids are being made and use that info to sell your player during those hours.
If you remember me, then I don't care if everyone else forgets.