I'll do $100 PP for 4.00 BTC.
Too low, sorry.
This is no problem to me. I did have to go reread your OP and I did misunderstand it. As I understood it, you NEED to sell BTC. As such, in my lowly opinion, you should be the one taking the shorter end of the stick. As I now understand it, you are expecting your buyer to pay over the market price he can freely buy at from another location. I guess I am confused as to what would motivate me to pay a greater price for that which I can buy for less elsewhere. If it is simply the Paypal counter party risk then I suppose that makes sense. But, yeah, I took the MtGox price and tacked on a shade over 5% in my favor not yours which would make a ~10% gap in what you were expecting which I imagine is too low for your liking.
I'm just writing all this out to let you know I wasn't trying to lowball you I just misunderstood what the deal actually was.
Good luck on your venture, I suppose someone who can only use PP to obtain BTC will be your huckleberry and I appreciate your service to those members.