There's also the reason why richer players do better in gambling. Even if there are only random fluctuations, from time to time a fluctuation is going to knock you randomly below a certain limit. Then a poorer player goes bankrupt. A richer player can absorb the loss. So a rich person can survive to try again another day. If this sounds frivolous, I don't mean it to be. I think this is sound economics, but I just don't know their terminology. A poor person has only very narrow limits in which they can experiment, but a rich person can explore more of the space of possibilities, without failing.