These "shares" bear more similarities to a an annuity than they do to actual equity. On top of this, I see nothing resembling an audited financial statement. Proceed at your own, in my opinion extreme, risk.
a) They are not an annuity. Their value will fluctuate with market demand based on dividends paid out, which are 100% of SatoshiDICE net profits.
b) Actually, the financial statements are better than "audited." All the information is mathematically verifiable using the blockchain, which is public. You don't have to trust any auditor, you can audit yourself any time of day to see exactly what SatoshiDICE is making (and some have done that in other threads on this forum).
c) Not sure if it's fair to call it "extreme risk" when comparing to other Bitcoin investments out there... you know what I'm talking about. It's verifiably profitable, and everyone knows where the profits come from. It's priced at 10x P/E and anyone who knows investing will understand this is a very reasonable valuation for a company with large growth potential and which already pays dividends.
SatoshiDICE is not a get-rich-in-three-weeks-from-your-investment, investment. It's a transparent, income producing asset, and happens to be the majority of all Bitcoin transactions on the planet
a) Look up
variable annuities. This looks very much like a variable annuity tied to the profit of a single company.
b) That's all well and good, but I don't have the inclination or technical skills to do that effectively myself. That is why companies hire accountants and auditors. This could be a business opportunity for someone with good knowledge of the inner-workings of Bitcoin and an accounting background. But for now it is, to me, essentially a black box. I would think that most other people are in the same situation.
c) When you compare this to something like Bitcoin Savings & Trust...yeah, it's less risky. However, when you compare it to all your investment options out there, it's incredibly risky. I'm not limiting myself to the Bitcoin investment market. You have to compare this to investing in all other options, not just Bitcoin-only options. I don't think the risk comes from the business being unsuccessful. I think your business model is essentially one of guaranteed profit. The risk, in my mind, comes from the organization of the business (basically a one-man operation) and agreement itself, which is probably unenforceable.