I come down differently on this. Flippers add value to the recycling and reuse of bikes. The price rise due to competition is value to all sellers. DKO flippers bring place or proximity utility to the buyer. Flippers that repair and restore add the most value and are rewarded economically. Efficient flippers prosper, less efficient ones, not so much. This drives all kinds to optimize within their particular operating model. I don't mind giving opinions or advice to any, since my internet advice costs little...and hopefully helps overall efficiency.