Do you think that gaming sites provide the opportunity to earn bitcoin? I wonder whether you have the experience of playing games of chance, and how many have you managed to earn this way. If you honestly, I do not trust gambling, and I am sure that there may be more to lose than to earn.
Yes. It could be 'double profit'. While you are playing games, you're also can earn bitcoin at the same time.
I'm not gamers anyway, but as far i know there is a games that you can earn altcoin (digibyte), don't know about bitcoin.