Well I'm a tool nut and also a lover of yard sales.
Consequently I have a garage full of tools. (garage is too small)
I generally justify any tool based on one or two uses.
Making things worst I weld and enjoy wood working.
I was also an aircraft mechanic so my collection is extensive.
A typical 'yard' example is a hi lift jack that joined my collection for $6.00 that I used once, Paid for!
A small drill press for $7,00. (really, I kid U not)
A wood lathe that came with tools that set me back a whole $100. and as time went by I probably have 30 tools and all at bargain prices.
Couple of months ago I popped in to a discount store and acquired a 3 way laser for the awesome price of $2.00, shucks did not even argue, just paid the asking price. LOL
OK, I'm a tool nut and know values but also I don't argue or beat down prices when I see a good deal.
If it's good I simply pay the asking.
On a few occasions I've been told 'if you can figure what it is' it's yours free. Now that's fun.
OK. I have one tool (looks like it cost mega $$'s) that I simply can't figure out. at the mega cost of $2.00 I had nothing to lose, LOL, I soon plan to post a 'what is this' on the forum.
All Net searches suggest that it is a specialty tool used in particle accelerator technology, this based on the brand name imprinted on the tool. The extreme precision of the machining suggested that the original cost had to be vert high. (pics and post to come probably titled, What is this)