A: Paypal take the side of the "buyer" (donor) not the "seller" (tracker), its the same on ebay, if you get a lot of chargebacks because you did not deliver the goods (and even if you did deliver them), Paypal will suspend your account. well a tracker is the same as an ebay seller to Paypal, lots of chargebacks in a short period, and they will suspend the account.
B: Because the donators donate that way, I put on moneybrookers, and used to have Egold on the site, Egold I got 0 in 2 years, Moneybrookers I got 2 donations in 6 months, so of couse I took them both off. Also Paypal you can set it up so when someone donates, everything gets done auto for the member, other places will take more work (coding) if its even possible at all.
Yes paypal sucks for the most part, but its easy for the tracker and the majority of donors, so thats the choosen method, even though I am looking into other options atm for my site, its just whether the members will use the other options, thats the problem. (and whether the Host will as well).