The truth is as vintage computers get older, we as enthusiasts who want to keep using them will need to obtain more repair skills. I started doing this stuff we talk about here in Marvin 15 years ago and back then I could screw up and break stuff all the time because I was getting rained on in ISA cards and 486's like pennies from heaven. But as the 2000's dragged on and the well started to dry up and more people got into it, and more of these machines got recycled, we've slowly had to go from "oh, VGA card is fried" or "Oh, I can find another IBM PS/2 Model 30 for $5" to "Well darn, time to dremel that Dallas Clock chip" or "Time to fire up those Soldering irons and go troubleshooting capacitors for the next few hours".
I've already vowed that the next time my PSU in one of my vintage machines blows up, I'm repairing it. There is no excuse why I can't. I have a VOM, I have a soldering Iron, a Oscilloscope is on my radar. I can wind and repair guitars pickups so PC PSU transformers are not that much different, and I've learned a lot about the kinds of adhesives and materials used in that stuff over the past several years. That's what the retro computer guys from the 70's and early 80's have been doing for even longer than I have - when their IMSAI 8080 goes down, they don't exactly have the guy who stayed up all night eating pizza and drinking beer some lonely winter night in 1975 to come on down and help them, nor would he likely do so if asked. I'm also taking up building guitar pedals - and let me tell you, there are more things CMOS than just your BIOS setting storage.
That said I do wish that the vintage computer market would get as much support as the vintage gaming market has. I always thought a great retro-system would be a multi-clock Intel Quark based unit with a clicky keyboard and trackball in the same box, that has XT-IDE and all that built right into it. Just clock it down for XT speeds, and up for Pentium speeds, after all, someone recently told me it basically is just a really fast 486 with modern features tacked onto it.