There are situations, as we found out, that Paypal is OK with the use of personal/gifted payments, where they don't take out the fee, though they're only specific situations. Everything else would be used as purchase/non-personal payments.
Okay, thank you. After discussing the issue with twztid13, I understand the situation better now. In hindsight, I see some of my questions here were a little stupid. >_<;
Given all that, I'm much more inclined to use Amazon Payments - they don't charge a fee, right? Sounds good to me! I've already put in my List that I prefer to use Amazon Payments to avoid the fee issue with Paypal.
It's such a shame. PP is so easy to use to purchase something, but I had no idea (until recently) that they charged the seller to receive purchase payments. I suppose it really isn't a lot of money, but where I'm already pricing my items so low (due to depreciated monetary value for many of the games), every extra loss is a little galling.
Amazon Payments doesn't charge fees, not at this time. They may in the future. I've used them a couple of times and they work perfectly fine as a Paypal substitute.