PayPal rules

I include the 3% in my price.

I won't even consider buying from someone wanting a 4% paypal fee. They are just price gouging.
Ya, i'm sure you could do it that way, but i'm one of the people that keep shipping, packaging, payment, fees totally separate from the part price.
That my business practice, and preference, in selling items on the internet.
So what's wrong with that?
Then why would you consider that "price gouging"?
Guess your gonna be missing out on parts from time to time, but if that's your preference, so be it, nobody is going to loose any sleep over it.