Which format worked out better and would give more net income on average for investors: Bustabit taking 0.25% commission on all wagers or what remains of their share after Bustabit deducts its share?
In terms of expected value it doesn't matter whether a 0.25% commission is taken on wagers or a 25% commission is taken on net profits. In both cases investors can expect to earn the same over an extended period of time. However, a 25% commission on profits is more favorable than a 0.25% commission on wagers because it has less variance.
I may have misunderstood your question, so correct me if I'm wrong.