I really hate to see that "PayPal Donate" button on this site. Any "eBay" seller would know what I mean. See for yourself at http://www.paypalsucks.com. See the horror stories for yourself!
PayPal does have problems when dealing with buyers and sellers. My wife has experienced them in the past. I hate PayPal because they make thepay for the loss.
However, John has decided to use PayPal to "collect" donations. Unless a member decides to use a stolen credit card... John does not have to worry about any charge-backs and he is not really loosing anything.