To the 3 above, gift's can be taken back just as easily as ANY other payment, even if you have tonnes of proof.
My advice, if you're willing to take off 10% from each payment, use playerauctions.
If you're a legit seller, and video/screen every trade [They have a guide on the site] You can't get chargebacked.
Also, if you're using PA, you can link sythe users to what you're selling, but also have the PA market there
Otherwise if not, say peace to paypal, cuz it's almost like it was made for scammers.
[Ps. they can limit your account for the dumbest things, and they will do it, and unless you waste your life unlimting it, you're fucked. Also, they have a huge ass fee of like 3% or something anyway, so PA isn't a bad idea as they PAY for the fees as well ]