11% a year is a good return, but the risks involved in investing in a site like JD are absolutely huge.
Being realistic the stock market should return 7%, maybe more on average, and is an incredibly safe investment in comparison. Plus any companies you invest with would insure your money up to a certain amount. If there's a fire at doog's place, or something happens to doog, or doog decides he's had enough... then we're all screwed.
(like I said, personally I trust him, but after what has happened at other Dice sites people should be wary)
The risk is definitely there but the return is there too
I made a little calculation the other day : On the last 14 days 2190BTC were wagered everyday in average so an expected profit of 21.9BTC/day or 657BTC/month => 1.4%/month or
18%/year with the compounded interests
If I was to invest I would want at least 15%/year to offset the risk
21.9*0.9; don't forget fees.