Why?
Why try to get old hardware to run these games? Why not run them in DosBox?
Well, why do some people buy old veteran cars, when a new car will do the job better?
It's something about longing for a simpler time. The quiet whirring and clicking of a diskette being read, fiddling with the config.sys and autoexec.bat files to make everything work, while freeing up as much conventional memory as possible. You just felt more in control of your computer back then - not like today, where you often have no idea what-so-ever what is going on!
I guess it's a kind of "you-probably-should-have-been-there"-thing. As I already said, it was in many ways a simpler time. If your harddrive crashed, you bought a new one - booted up from a diskette, tranferred the system files and restored your backup - and in about an hour (depending on the size and media of your backup), you were up and running like nothing ever happened! Today, most people only have backups of their documents, and not the entire disk. So if your harddrive crashes, you could easily spend days getting everything back to how they were - or something that resembles it.
Yes, I can play Pinball Fantasies on my i7 pc with the 27" FullHD monitor - but it's just not the same as playing it on period hardware. For some weird reason, playing it on a PII 233 with a 17" 4:3 aspect monitor makes the game feel better.
Not that it means that everything old is better! Even when building an "old" pc, not all the components need to be old, in my opiniom. More on that later.
I guess you need to have a certain age, having remembered sitting in the glow of the CRT monitor late at night, fiddling with the hardware or playing a game that you bought at a physical store, took home and hoped that the media in the box was readable.
If not, you had to wait to the next day to go to the store to get a (preferably) better copy - unless the next day was a sunday or holiday, in which case you resorted to screaming at the monitor. Which is odd, as it was not the monitor that had failed reading the media. It wasn't its job.