Just had a somewhat related thought ...
I've not worked as a machinist, so I may be somewhat off base. I'll be more than happy to hear from any of you "real" guys.
Anyway, my understanding is that professional machinists are expected to have their own measurement and setup tools. Unusual tools, spare cutters, drill bits, super-precision measuring tools, etc. are there in the tool room. Well, as home machinists, we don't have the luxury of a tool room. So we have to equip ourselves with whatever seldom-used tools we need or might anticipate needing. Guess that's just the way things go.
I also recall the "sticker shock" when, shortly after retiring from HP, I had to purchase something other than the common stuff you can get at Home Depot. I was so used to just writing up a requisition and letting the purchasing department take it from there. It was all "funny money" ... until I had to pay it myself!