2. I had this thought about inflation. Wouldn't it be a good idea to add it to the game? It would help in keeping the numbers on a reasonable level and also it would encourage players to make the cash flowing all the time instead of banking it up. I'd suggest around 0.5%/day inflation (to make things transparent, player would just lose 0.5% of his banked gold daily). It's 500 gold lost per 100 000 gold banked per day which seems reasonable. 0.5% may be too high, it depends on how the economy will be balanced in the end.