If you want to make as much as possible you need to make your payment as easy as possible and as common as possible. The average guy still is not clued into to Paypal. They expect to see Visa, MC, AE and Discover. They don't expect to fill out a bunch of additional Forms to make a purchase.
Paypal works but it's nothing great. I have had many problems with paypal and run of the mill shopping carts trying to make purchases.