Money: What is it good for?
I'm playing TftB for the first time and I was just curious if I need to save as much money as possible or if I can spend it on some sweet cosmetic upgrades. Is there anything story related later on I should spend it on?
P.S. I already know that if you spare Felix you get a ton of money at the end and it can be spent to have a "mystery vault hunter" join you in the last episode. So is there any other story related money uses?
P.P.S. Does the mask that you buy in episode one ever come into play again? Just curious.