Originally Posted by Oshawott
I'm not 100% sure about this, but I think the cash is only for fashion and a few other things (like bonus lives and character slot cards).
Someone correct me if I'm wrong.
what you said is correct, but it's also for extra skill slots, cash jobs advancements ( you'll instantly go from Dark mage to Void princess etc.)name changes and even pets eventually. So it's somewhat like a GC cash shop but the inventory isn't as hax just somewhat helpful.