The question was asked so here's my two cents(or maybe less), which is of course, the Truth..... (just joking)
Back when service stations fixed cars (They're called Speedway and BP now, for those of You under 30), this was always my favorite sign......
General diagnosis: $5
Normal repair: $10
You tried to fix it first: $1000
Strange looks: still FREE
And that sums it up pretty much for me. When I see a unit has been professionally refurbished by a certified factory trained technician who invented electrons, runs NASA, graduated PHd from MIT, Sorry, I'll pass.
If the equipment is going in my collection, any hands in it but mine are HACKS. I look for "sat in Dad's basement for 15 years since the last time it was used, original owner, never serviced ---- That one I want.
This may be a warrantless, completely horrible thing to say, but it's honest to how I approach stuff.
Maybe its just me, but I wonder ??? Would You rather buy the "only 1,200 miles on freshly rebuilt motor" or the "120,000 miles with no major problems, all records kept ???" This analogy is for a used car, and I'll buy the latter, not former.
Give an A$$hole a can of de-oxit, and they think they're Nuclear Physicists.