Internet Casino Question

[bball233]

Not sure if I'm in the right forum. I really only bet on sportsbooks, but out of boredom I will put money in their casino's (roulette, blackjack, other games im convinced are rigged) and then lose it. But after a week or so I will go back on casino without putting money there, and they will have money there for me.. it's been as low as $1.00 and as high as $132. It happened on bodog and cybersportsbook. Anyone know how they figure out what to give you and I guess what kind of bonus this is? Just curious. Thanks.

just keep u as their customer