Im not sure if anyone would be interested in this but i was thinking about how theres only a limited number of ways of making money on Miss Bimbo (games, challenges and buying from the bank) so how about improving the banking system so that, like real life, bimbos can deposit money into the bank and earn interest on the money thats in there.
Make them work for it however. For example earning interest on the money they have in the bank but they dont earn the interest automatically, they have to click a button to get their it each day.