If you buy good used equipment or tools, you should come close to getting your money back. Stuff depreciates to a low then hovers there as long as it works. Caveat is how you dispose of it. Have an auctioneer come in, you'll be paying a commission.
Buy new and you're looking at a 60% - 75% return on your money or less. I bought a G0709 lathe 2 1/2 years ago for around $4500 delivered. Added a taper attachment, 5-C collet closer, 1/64" increment set of 5-C collets, around 35 QCTP holders with boring bars/cutting tools, DRO, 8" set-tru chuck, etc. Probably have $7500 into the lathe and accessories. If I sold it as is, I'd start at $6500 and hope to get $6000. I have a number of Starrett and Inerapid micrometers and indicators which were picked up for around 30% of new price.
Bruce