I think it's fine where it is, but increasing the max bet will make investors more money in the long run
Please don't do this. Variance will burn us investors big time. The edge is already very low. The more small bets there are, the closer it gets to the ideal of 'you give us your money, we give you 99% back, you give it to us again we give 99% of THAT back, and every 72 turns we have half your money'.
Larger bets means someone can make a score at our expense with a few large bets and some discipline.
No, it won't. That's why you invest with thousands of other people, so that your collective bank can be very large. Variance is the investor's friend, as gamblers are going to gamble. Doog posted a graph of the total bets, and EVERY bet is already very very small with the exception of a teeny tiny amount of outliers.
As an investor, YOU WANT LARGER BETS because you have the edge! You can't beat the house with "a few large bets and some discipline" because you don't have the advantage. If what you are saying is true, then every casino ever would be broke.
Obviously realistically this doesn't really matter, as there are only like two people who can even think about touching the max bet number, and to be safe it could only really be raised by about 4x what it is right now, but the principle is still true. The larger bets you are willing to take, with an edge, the more money you'll make in the long run.