I don't know about the sock market, but there are lots of categories where the arms race for user revenue-maximization has either not yet started, or everyone i

I don't know about the sock market, but there are lots of categories where the arms race for user revenue-maximization has either not yet started, or everyone is using very old techniques. A better example would be someone selling "cheap" socks but with expensive shipping. Or, aggressively upselling additional sock products in the checkout, possibly with FTC-unfriendly opt-in vs opt-out methods. Or, hammering their users with advertising after the sale by email and phone. When a particular vertical market gets aggressive, the item being advertised usually brings little, no, or negative revenue to the advertiser, and all of the money is made on the back.