I don't even want to think how many thousands of dollars I've spent on customizing my machines over the past decade.
I mean on a full on system like Muzzle Flash, I may have spent like $1500-1700 on items like CPU, mobo, ram, video, and a case ... and at LEAST another $2000 to $2500 for acrylic, tubing, water blocks, radiators, pumps, flow meters, the Aquaero stuff, paint, wire sleeve material (and before that, maybe another $400 of custom tools, which can be used for multiple builds).
It's an expensive hobby when you go "all in", but honestly, it's cheaper than my others ... boating, motorcycles, guns, and world travel.