Dunno.

I bought a unicycle a while back, and paid by paypal. I used the option where it's taken from your bank account, and didn't realize, that if you don't have a credit card as a back-up source, that option takes 4-5 days. (An E-check, they called it). But I think the seller still had a notice from Paypal that I was paying, it just took a while to clear. And I wouldn't think assorted buyers would ALL be ignorant of how that worked.

Make sure you don't have these people going into junk email or something.