I estimate I've spent $3k over the past 3.5 years. DIY 4 tap keezer, 3 5 gallon kegs, 6 2.5 gallon kegs, beer gun for bottling sometimes, freezer ferm chamber, 3 primary fermentors, 2 glass secondary, on my second square cooler mash tun, food grade containers for bulk grain storage, vacuum sealers for hops with 5+ lbs of mixed hops in the freezer, large pressure cooker for canning starter wort, just started a frozen yeast bank.
Built a fermentation chamber from scratch early on, but ended up scrapping it. We moved to a new house where it would be located in the blazing hot garage as opposed to the cool basement where it was previously. Chamber was too big for the little mini fridge to keep up with. Ended up freezing over and quit working, then all the ice melted and ran down the side and underneath causing mold. That was about $500 down the drain.
Gearing up to build a large cooler under my basement steps to triple as kegerator, bottle storage and long term aging storage at 45 F. Will also be replacing all my bar/countertops with concrete countertops. Will be costly, but so friggin sweet.