I dont know your niche but accept only paypal without credit card is not look professional because people with money in most cases pay by credit card.
I am also looking for an alternative payment option. One domain (bestscriptvn.biz) has purchased 4 of our scripts. They get to download immediately, and then the charges get reversed because of stolen credit cards. With VCC and all that, people can easily verify their accounts. Has anyone used 2CO with phpaudit?