Just as the Classifieds demand a price to be listed on all adverts so too should there be a ban on listing 'PayPal gift only'. Sure it may not solve all the problems but it might stop a few chancers and repeat offenders.
Treat everyone with caution and simply protect yourself with some buyer safeguards, if the seller doesn't understand (or just charge 5% more in the first place to cover costs-how hard is that?) then they are idiots and should be treated with the caution they deserve (even if they are Gold Traders, as a number of scammers have proven, it's only a name not a guarantee)
Si-i-lent night, ho-o-ly night. All is calm, all is bright.....