I once withdrew about $700 from a sports betting site. I used to bet everything I had including 6-7 month salaries in a row. 
Later I somehow managed to stop playing. And a month after, I got a message from them saying they added 40$ to my balance as a bday gift 
(it really was my birthday). I put it on basketball and won almost x20. Withdrew and never came back.
Later I somehow managed to stop playing. And a month after, I got a message from them saying they added 40$ to my balance as a bday gift (it really was my birthday). I put it on basketball and won almost x20. Withdrew and never came back. This is to lure you to comeback since you are wagering big money in the past, you have a good control not coming back to play again after winning twenty times of the gift, it's not easy to do that, it seems you don't trust the gambling site or you stop gambling, if you're still gambling I doubt you will not come back again, the temptation will always be there.