How did you arrive at 2-3 cents for the average roll? The top Free BTC roll prize is $200, it's fixed along with all prize levels below it, regardless of the price of bitcoin.
I can show you my calculation if you want..
https://docs.google.com/document/d/1JtwnXVjswztX0gVzqffW0gaKppQyWGG_dl4Kcnt6HDg/edit?usp=sharing
That's the document I put clear calculations in.
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If there are 6 available prizes, being the maximum 200$ 0.1$ st the moment, and each prize is divided by 10, the you have 0.1/0.01/0.001/0.0001/0.00001/0.000001 then, it would be 200$/20$/2$/0.2$/0.02$/0.002$, and that 0.002$ is the average roll on every user
Lol, I don't really see your maths. If just by pure chance the provability to hit the lowest prize is 98.85%, how is it not going to be the average income per roll on every user? You have to be a really lucky bastard just to hit the 1k prize (0.99%) and moreover to hit it repeatedly. And adding an example (in my acoount) I have about 2000 free rolls and that has given me aprox 450k satoshi. If you multiply it by 5 (to reach the 10k rolls you mentioned before), you would get 0.02 BTC and 0.02/10.000 =0.000002 =0.002$