Last year, Bring a Trailer auctions drew nearly two million comments, and the site registered more than 200,000 new users. An active legion of commenters pepper each auction entry with informed dialogue. “Watchers” track the bidding via email and may jump in at any time with bids of their own. In 2020, for example, a tiny — and rare — Austin Mini beach car attracted more than 500 comments and 1,000 “watchers” before selling for $230,000 to a collector in Germany.
Besides smallish competitors like the Sackeys’ site and Marqued, a recent