People just don't like extra fees they don't expect. Like... about literally anything. Everybody gets crabby when they're told the price of a thing and then get the "but WAIT. There's MORE!" It's the same logic as,
$10 +$2 shipping : (
$12 free shipping : )
Minds just... work that way, aha. You should be baking the fee into the cost of your overall price tag anyway because it is against Paypal TOS. ... Like, yeah. People break the TOS all the time---but idk why you'd openly be advertising this and risking getting shut down in the first place. It's all fun and games and we all break the rules until one bad apple comes along and gets pissy for some reason and decides to take advantage. Just keep the fact the fee is part of the price you're charging on the DL, and nobody will even know and Paypal will be happy.
It's one thing if everyone is just. Breaking rules and circumventing things in silence. It's another when someone is openly waving around "I'm breaking the rules, and we're all doing this anyway!!" because if the higher ups figure out how people are circumventing said rules, they'll find a way to tighten them further.