Seems like a lot of demand using paypal. I am in the process of creating a marketplace/escrow service to ensure safety and prevent fraud but I am wondering what type of fee and minimum transaction I would need to do to make it worth my time.
Would you be willing to pay 5% fee to be able to buy using paypal?
The fee's won't matter, the main problem with PayPal is is that chargebacks are extremely easy to do. It's hard to take measurements, except to put limits early on or without verification, but that only annoys users and is a lot more trouble. An exchange via PayPal is hard, and it'll all depends if you'll earn more over the chargebacks.