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Mate, read again the question what OP asked. He is looking for a gambling site which offers investment option. Both of your suggestion don't offer that.
There are a lot of gambling site that you can invest if you want to become profitable on this way. I suggest you to go with crypto-games.net and satoshidice, they are making good amount for their investors and don't forget with kingdice, this is quite new but still it's giving it's investors good return upon investing. Remember that all casino investments are risky, invest what you afford to lose.
I never heard if satoshi dice is a good place for our investment. Where is the proof if they are also reliable as an investment place?