I've got extremely limited experience in this, but in the banks I've been involved with, the goal was to give around 50% of the EV to the players and 50% to the investors, erring on the side of the investors. The pay was structured so that if the play ended with a small number of total hours, the player percentage of any net win was small (due to the effect of variance and the relatively high probability of a loss after that time). As the number of hours accumulated to larger numbers, the compensation plan was designed so that the players' percentage of any net win would increase, and at the limit, would approach 50%. Since it was difficult to determine exact EV and variance, estimates were made that favored the investors slightly, and all parties understood this going in. By the time we hit N0, the player share amounts to around 45% of any net win, since at that point, the likelihood of a loss is low, but more importantly the average amount of the loss is likely to be fairly low if there is a loss.
The exact calculation we used was based on the distribution of possible results after however many hours we played. The average win (provided there is a win) is obviously larger than the EV, since it throws out all possibility of a loss. We agreed to set the player share so that the probability of a win times the average win (conditional on a win) times the players' percentage equates to 50% of the EV, again using conservative estimates for EV (low) and variance (high). That means the percentages changed continuously as more hands were played, starting with a small player share, ramping up fairly quickly at first, and more slowly later, eventually approaching 50%. It isn't perfect, and it I'm sure there are better systems out there, but the fact is we weren't sure how many hours we'd be able to get on a play. It might last 2 hours, it might last 200 hours, and we had to account for all possible durations. This was the fairest way we could come up with to structure the split, and so far it has worked fairly well at aligning the interests of the players and investors. As Automatic Monkey mentioned, these conservative estimates of EV and variance imply a higher N0 than in reality, but once you get anywhere close to N0, the player share isn't going to change by more than another couple of percent, so the players aren't getting "shorted" by much by using those assumptions. I guess the bottom line is we were all satisfied with it, and we all felt like it was a fair deal. It suffers from the usual flaw that if there is an initial large loss and the N0 is high, the players have reduced motivation to play, so it might not be appropriate for straight counting. For games with a short N0, it seems to work reasonably well. Feel free to dissect it and show me the flaws :laugh: