I think having such a low-stakes game to play would be beneficial not only to highly risk-averse individuals, but to anyone. It would provide a useful training ground (maybe even a competitive ladder in a rationality dojo) for anyone who wants to also play with higher stakes elsewhere.

Edit: I'm currently a mediocre programmer (and intend to become good via some practice). And while I don't participate often in the community (yet), this could be fun and educational enough that I would be willing to contribute a fairly substantial amount of labour to it. If anyone with marginally more know-how is willing to implement such an idea, let me know and I'll join up.