Bitdice and Crypto-games would be nice for investment on other hand Betking is also good choice but they will make another plan there so better wait before any investment there, Bitdice and Crypto-games still doing job with investment so you can make investment there.
I believe betking has removed the investment feature on their website, and instead are now hosting an ICO for a % share of their website's profits.
I actually missed that news. Thanks to monbux's post I researched this and there is official announcemnt thread:
https://bitcointalk.org/index.php?topic=1697106And I don't know if if like the way gambling services are trying to switch to ICO model after vDice. I feel like this will be short time investment and then we will see huge crash...