The bidding was fast and furious as the bids kept going back and forth. You only have to increase the bid by $5, so it makes sense if someone was bidding $3500 another $5 won't make them go away.
ABCTeacher.com expiring auction had 179 bids and sold for $3805. The domain is 12 years old and according to Go Daddy, had estimated monthly traffic of 2744 hits. Of course Go Daddy promises no guarantee of future traffic on any domain.