If the buyer pays by sending the PP as a "Gift" he/she loses the right to file a claim should something fraudulent happen. If the seller asks for it to be sent as a "Gift", the buyer had better be aware of this. I would be extremely wary of buying from a seller who
demands this form of payment.
If the seller's terms are "$XXX +3.9%
or as Gift", it's the buyer's prerogative to pay the fees, take the risk, or simply choose not to deal with that seller, for whatever reason(s), be it for cost, morality, or "buyer beware" reasons.
I was only recently aware of this "Gift" option, having received payment for a knife this way and being surprised that no fees were charged. In my more recent sales, I asked that payment be sent as a gift*, but I made it very clear about them losing the right to file a fraud claim, I thought that was only fair. If they had preferred for that reason, or for ethical reasons, to pay the traditional way, I of course would have accepted and eaten the fees. No way would I have charged the extra 3.9% - I don't understand the people who do this...why wouldn't they just add the fees into the asking cost of the item?
The thing is, PayPal used to have different fees for different accounts. A "Personal" account didn't charge fees, but a "Premier" (I think that was what it was called) did. A Personal account couldn't accept CC payments, but a Premier could. Then they changed it so a Personal account could, but charged like a 6% fee. Then they changed Person accounts to a flat fee. Then they changed definitions and fees about 8 bazillion times since then. They've also changed the amounts/times you can PP balances into a bank account. I have no idea when the "Gift" option came to be. The fact that it used to be free and no longer is kinda gives me the feeling that I'm being bilked, which led me to ask for payment with the "Gift" option.
I fully understand the ethical/moral reasons people have against "cheating" PayPal out of their fees by sending a gift, even if I don't fully agree, at least in my case. If I were a power seller, or was selling on eBay, I'd feel different. Actually, I'm feeling different about it as I type this and think about it. Especially if I think of it as PP saving me time and a PITA visit to the bank to deal with a Money Order (and the buyer too, probably). One could also think of the fee as a "Piece of Mind" fee that you're selling to the buyer as fraud protection. I probably won't ask for for payment to be sent as a "Gift" again.
Although if the buyer does this of his own free will without asking, I'm not going to feel guilty and PP some money to PP.
*FYI, if you use a credit card to send money as a "Gift", rather than using an existing PP balance, or the standard bank transfer, PayPal will charge the
sender a fee, not the receiver. I found that out recently at the unfortunate expense of my one of my buyers, but we resolved the extra cost post-sale.