Betting to earn rewards from promotions and contests is one of the best way to make a profit. In one gambling site i've lost nearly 0.05 BTC and withdrawed 0.2 BTC from doing promotions. Sometimes you have to be careful because there are promotions that aren't profitable.
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What do you mean by Betting to earn rewards from promotions and contest?can you share some sites that offers such?i guess i will be more interested on this kind than just bet in usual way since i have rested from gambling for a while.and it looks like you earn more than what you have lost.
Another thing i guess that theres no easy straegy in gambling for this needs luck to get goood profits