I've got close to 600 Ebay auctions under my belt, about 50/50 as buyer and seller.
For the most part, the folks who get screwed on Ebay are the ones who don't use Paypal. Many seem to fear connecting their banking info into the deal.
In the case of the brick in the box, if the buyer used Paypal and the seller wasn't established, the $$ doesn't get released to the seller until the buyer says he's satisfied. Seller doesn't see one spec of the buyers financial info.
The reason the seller has to disclose banking info is so he can't disappear, and he can't sign up if he's phony. In they're unverified (haven't established that they are who they say they are, financially), they don't get the chance to run off with your money. If they do, Paypal reimburses you.
The system works very well if you'll trust it.