You can invest bitcoin on bitcoin gambling site.There are some sites you can make profit by investing.You might follow this thread to know which site was making profit for their investor.
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Bitcoin Gambling Investments For me its not good to invest in gambling that is not profitable that was test on your luck and gambling is for rich people who are looking for an entertainment much better to invest in trading or sports betting for me do not need huge amount of capital to earn bitcoin.
Me also i do not like to invest in gambling more of my friends are loosing lots of money and never get income in gambling that is why i only do trading method even it takes long time but still i get income of my investment that is the important for me.