They didn't used to have Guest checkout. So now it is easy to circumvent the email that is associated with an account.

I'm pretty sure I got the idea from someone else on here. But I have noticed that other websites go by the email trick, too. Like to get free shipping on your first order, things like that. That's how I ended up with a pile of email accounts, but it's easy if you just add different numbers to the end of the main one. Shameless, I know.