Once again, you get a lot of services for the price. If you only need to accept paymemts and you handle all the rest yourself, plus you don't need a good, personal customer service (PayPal and Google's service are not good at all), then PP or GC are a better choice for you.

Plus GC only works in the US. Maybe UK. There's rest of the world as well.

Your profit margins must be insane if you can afford to give 6% of your earnings away for some glorified credit card processing.