Well, I think that working so much on SH3 thrashed my last PC to death. It died January '07 IIRC... (Nearly immediately after the release of GWX version 1.01.)
...so I had the current one built for about $2700.
I think that I'm on my 5th or 6th keyboard now. (I don't pound the keyboard... I should just quit buying the cheap ones I guess.)
3-4 mouses, mousi, meese, mice, or whatever you call them.
Loads of reference books/material.
Two copies of SH3.
One copy of SH4.
I've no desire to add all that up.
...and that's just the monetary bit.
The rest I file under, "What was I THINKING!"