Actually it's mostly on niche stores that sell limited edition items like Yeezy Boosts, Supreme, BAPE. They even do it for clothes now. They have a release date and time and sell out within seconds
How is Etherium's latency? Would it be at all worthwhile to pursue building a shoe-bot (or other HFT/bidding bot) on an Etherium platform? Is there a future where users could pay more Gas to get a low-latency response?