But when you suddenly start making real money, the game completely changes. You start getting personal phone calls from real people, you have actual phone numbers that you can call, they contact you at your cell phone, and they tell you things like "Due to rule xyz, we would technically have to freeze your account, and the next time you log in, you'll message saying if you don't provide information a, b, and c, you'll get locked out of your account; don't worry, that's not going to happen, but please work with us to determine what we can do to meet our technical requirements for donations coming in to non-profit organizations" and "We've been noticing customers filing chargebacks, however we do recognize that your chargeback rate is far below the usual x% [I'm not allowed to disclose this number] so we'll just front you the money until we rule the dispute; we also noticed you're no longer bothering to dispute the chargebacks, is there a particular reason? Is there something we can do to help you improve the process?"
You get personal phone calls like "We noticed your sales volume this month has dropped by x%, is there something we can do to help?"
Basically, I have come from hating PayPal and searching desperately for an alternative, to recognizing that they are doing their best and working very hard on a very difficult problem. I have worked with startups that are loved here on HN that have tried to solve the same problems, and I must say that though I was initially impressed with their work, they did not know what they were getting into, and I now actually prefer that my customers check out via PayPal than via my credit card processor alternative that I initially set up to spite PayPal (but, of course, it's important to have both PayPal and a traditional credit card processor for checkout).
EDIT
Yes, of course. Downvote me for providing some insight that puts PayPal in a positive light. How dare I.