I started a thread a couple of years ago similar to this one, because gameristo has been known to use multiple PayPal accounts and to send PayPal funds to you before any deal is struck (at least that's happened to me before).  Now, there could be legitimate reasons why he has control over multiple PayPal accounts, but that's something that always bugged me.

And I got a warning from PayPal not too long ago saying that the friends & family payment method was not to be used for purchases/sales, and I took that seriously.  Gameristo is otherwise completely trustworthy as far as him not scamming you, because there were a few times when he surely could have but didn't.  I'm not sure I agree with everything OP is recommending here, but definitely use caution--not just with gameristo, but with everyone you're trading with.