OP could be a shill?
i guess yes too because that address got 11 btc but not returned 11 btc 
Also pretty odd that the OP received exactly 11BTC just before he "accidentally" sent exactly 11BTC to the website.
https://blockchain.info/address/1NmbtmxBGFbw8ms89q8tKqpco6Gmmz7a3S
That's quite a coincidence.