SatoshiBones is selling 10% of all future profits for a total of 250BTC:
http://bitzillions.com/satoshibones/stake They are wonderfully honest and transparent but from looking at the payment reports it seems as though not even the biggest investors are making more than $20 per month. The converter I use is here:
http://coinmill.com/BTC_USD.html I wouldn't invest in this because I want my investment to be a highly profitable one! And won't each investor's monthly payment decrease even further as the 10% is dispersed between the final total of a HUGE number of investors? Because if that's how it works I don't see why anyone would buy shares.
That website doesn't meet the requirements for provably fair betting. They don't post the hash of the server seed in advance, which makes it possible for a malicious operator to skew the results. And even if the operator is not malicious, the fact that the hash isn't posted in advance makes you question the experience/knowhow of the operator.
Anyway, the bet volume on that site seems really low. 250 BTC buys you only 10% of the profits, so the expected gains are really low, especially considering the fact that the Bitcoin gambling business is highly competitive, with new sites and innovations popping up regularly. SatoshiBones is a straight-up clone of SatoshiDice without any new innovations to attract gamblers (the house edge is slightly smaller at 1.5% instead of 1.9%, but there are plenty of 1% edge sites already). Furthermore, there is no information on how you can withdraw your investment, if it's even possible and whether you can always withdraw the full invested amount even if the site loses.