http://coinpoly.com/A few things that would lead to believe its a scam
1) their Bitcoin price is often below market rate (OK Coin/Kraken/Coinbase)
2) They claim to be able to exchange Bitcoin for paypal/credit card (which is pretty rare)
3) I believe they have a release time on Bitcoins, so you pay them, and they release it in 10 days or something. I believe if they used fake Paypal accounts they could transfer your money out by then, so when you complain that you didn't receive anything and try to chargeback, their paypal account would already be empty
4) I tried to test it out with $10 (money I would use to test it), but it requires a minimum $100 (which is a lot to gamble to test if the site a scam I would be out a lot)
So, everything tells me this is a scam but I would like to hear other people opinion about this.