It backfires sometimes. I remember the Wii U and Xbox One X suffering from scalping one for it to backfire. Personally, I wanted to wait until next year before buying either system. The scarcity kinda made me anxious but I'm back to my senses, now. I think a lot of gamers are going to realize that, at least for now, there isn't much incentive to upgrade so early. I watch comparison videos and I'm not blown away. Gonna buy Sackboy and Spider-Man MM for PS4 and be satisfied.
I'd never buy from a scalper, anyway. Too big of an investment to trust some random seller. I still expect things to cool off majorly after the launch window.