after ebay, paypal, and shipping fees (if you offer shipping, which most do). It's a very small profit, but still a profit. The question to ask though is how fast can you sell them at $15 when others are offering $10 or less. It's also a product that's going down in value rapidly.
My personal opinion is that you wont be able to unload them fast enough to make money. Not trying to be negative or a downer, but I've sold a lot of things on Ebay over the years and I don't think this will be a profitable venture for too long.