Not sure if I made myself clear enough. I'm the one selling my bitcoins for paypal.
Ok, so the question about paypal remains..what's the benefit for you? They're just a payment processing company. Or are you talking about eBay?
I also just found this thread on using Paypal,
https://bitcointalk.org/index.php?topic=164254.0, and it's mostly reasons to be cautious.
The thread is old though. Paypal may still prohibit the exchange of currencies.
I don't understand your question. I am earning bitcoins online and the benefit would be to liquidate the bitcoins for real cash then deposit the cash into my bank account which I have connected to my pay pal account. Bitcoin is just crypto, its not real money.