It's obvious that it's not enough. Perhaps shop prices and choices should be modified to encourage spending. As low as it is however, the amount slashed by monsters could need to be lowered. Maybe I'm incorrect. The inflation rate is exponential. However, the rate at which one earns GP is not.
What is your team's proudest in-game accomplishment(s)? It was something which made you feel good when you finished. It could be anything you want, such as the level, cape comp killing a boss and other community-related things