I take it you've done your money. I dont think you can win on any online game. I used to play, done my cash as well till I realised it was always the same names winning. I now stay clear of any of these sites. I rather go into the bookies lol.
I think its a"sprat to catch a mackerel" situation, they let you win a little at first and then they reel you in.
Go and play for real at Mecca or wherever and if you dont play between games it isnt too dear at our nearest [ Chadwell Heath] there are free books on a Thursday.
But if you play on line you can just keep going, its like the bookies they never loose. See the light, give it up now.