Comment by BadBadJellyBean
3 hours ago
It's also very important to understand that Valve has 100% control of the marketplace. They don't have to hope that Best Buy or Walmart or whatever secure their system against scalpers. They can enforce account history requirements and rate limiting or what ever they please.
I'd be extremely surprised if they didn't do that.
From what I've read the limitation was having a "premium" account (spent at least $5 on Steam) and maximum controllers was 3 per account.
EDIT: I see others here mention 2 max. Haven't heard that before, but that makes more sense to me.