Guys, please look at the blockchain!

https://blockchain.info/address/1pTXE3DUJvhaKxuSxGivRF6yYn2TN5nar
He was betting via transaction e31298286e4794a6f684798b74e2ec8bf4d44ac965387313fee12ece0f721531 on 2013-03-23 18:18:56
and received his win 1 minute and 3 seconds later via transaction 2ad6ffe41c23b48ee7f134ff14e3ffac832f78ad171159acad6c2d8f9d2a7d1a on 2013-03-23 18:19:59

The win was sent from the adresses 1CuCsiTE1FFtNhSE8GZ7wRQciA8FppYgFA and 1CGoyGLKePzdFPDkviFckR4MjNUkWuNiCc which are adresses betcoins.net seems to use to transfer money into the casino / which are adresses betcoins.net has money on to sent the wins from.. These adresses aren´t tagged in blockchain.info, so they don´t show up as "betcoin", if you click on them, you will see that these adresses are related to betcoin.net.
A transaction is NOT send from the adress you send your BTC´s too in 99% of the cases. This is just how the Bitcoin protocol/blockhain works and is completly normal.
Feel free to lookup the betcoins.net adresses in blockchain.info ( for example https://blockchain.info/address/1N6weNFroYC54w54KMV3Pwb1mY2MeR3iJA ) and you will see many transactions where wins / losses are payed.