I am still pretty new to this awesome game, but I've got a ton of money from mining minerals and selling all sorts of stuff.
I've bought the miner's helmet, and some dynamite and a few other things but it seems like there should be more expensive items. Maybe I'm missing something? I have 4 NPCs (Nurse, guide, merchant, demolition), do future NPCs have better wares? Does the merchant ever get new items? What's the point of all this sweet sweet cash?