It would be interesting to look at the Bitcoin gambling sites that allow investment and look at the return on investment : is it always less than the expected return?
Not always, but often:
http://cryptobettingindex.com/dice-invest/
JD performed much worse than expected, and DD performed a little better than expected:
Just-Dice:
profit %: 0.358918%
bets: 1,269,212,581
wagered: 5,321,023.05358971 BTC
profit: 19,098.09848411 BTC
Doge-Dice:
profit%: 1.164336%
bets: 611,254,823
wagered: 91,725,150,532.35952759 DOGE
profit: 1,067,989,011.50250530 DOGE
Edit: I just checked that cryptobettingindex link and the math seems all wrong:
On the 3rd row, -85 is less than -1% of 8.3k for instance, not -0.977%