Can someone explain what's about the 0.91% edge? As I see it it's a 1% edge atm..
This is missleadning..
The jackpot which results in a +7x added to your payout on a 77.77 roll and makes any roll a win results in that edge.
I am also a bit puzzled by the edge percentage.
My calculations give a different percentage.
Here is what I understand:
Say the house has an edge of x% (in our case, x = 0.91).
Suppose I have 1BTC, and I make a single bet of that amount.
Then the expected amount I have after the bet *should* be
1 - x/100 = 0.9909 BTC (*)
Let's now compute the expected amount I have after the bet.
Say my bet has payout factor 2, i.e., the win chance is 49.50%.
If we ignore the jackpot bonus, the expected amount after the bet is
2*0.4950 = 0.99
(if I win I have 2 BTC, if I lose I have none)
Jackpot occurs with probability 1/10000, and if it occurs, it results
in an additive bonus of k times the amount bet (n our case k = 8, I believe).
Thus the expected bonus in my 1BTC bet is
1*k/10000.
Combining the above two we get that the expected total amount I have after the bet is
0.99 + k/10000.
(I can add the two, because of the linearity property of expectation.)
For the above amount to be equal to 0.9909 BTC (as we expect from (*))
it must be that
k = 9.
In particular, this means that if the outcome of the bet is a jackpot then
- If I had bet high, then my balance after the bet should be 11BTC (i.e., profit of 10BTC)
- If I had bet low, then my balance after the bet should be 9BTC (i.e., a profit of 8BTC)
If the above is correct then I think that the value for the multiplier k that is used
currently (k=8?) is lower than the one that would result in the advertised house edge.
Please let me know if I have messed up something.
Regards.