I figure I've spent around $1K at the Ace Hardware by my storage unit/shop in the last three years on nothing but SS hardware and drills/taps/dies.
I am glad that I am not alone with hardware purchases, even with drawers of garage stock hardware at least twice weekly I do a "Meet & Greet" with the employees at the local ACE Hardware. A full speedster build I budget $400 for misc. caulk, hardware etc. and run through that like a summer's night beer inventory.