Shotzy and tbirdkid make very good points and one I would consider given my experience with paypal.

Otisbagotis is incorrect because if it's an ebay transaction the payment is held for a month or two (or 3 according to tbirdkid).
I think if positive feedback is left by the buyer then it will also be released.

If I'm happy with the $15,000 sale, I would end early to avoid paypal.
Not necessarily their fees, but the unfair way they treat ebay sellers, who btw are the ones that actually pay them.