I know gree likes a good money making scheme so here's a new idea, new classes. Can't be too hard to write up code wise. the higher the class, the the more gold you need and keep the 3 current boosts or add extras further down. I'm sure this is easy money for gree and I think I speak for the cc community that more money and quicker energy wouldn't go a miss, as long as ltq's don't cost an extra vault to complete.