let the user determine what is best for them.
additionally, insurance could be another revenue stream for doog, and reduce the variance in his income as well.
1) if insuring was free, then implementing it would be a waste
2) if it had a cost, it would be a disservice to users: a way to con them into giving us more money without real benefits
3) if we did it anyway, we might end up into a paradox where if a user loses (x-1) times in a row, it's better for him to lose his next bet than to win it
For point 3, since the game is "random", a user cannot intentionally cause a loss.