Some people have favorite software that doesn't run under later OSs; others just like being out of the mainstream. Dell 2400s are often $25 on local BB's, even FREE at dumpsites and from friends. With CPU speeds 2.4-2.8 gHz or so and hard drives of at least several gigs they're potentially super performers with 98SE.
Realism is important -- '98SE CANNOT replace a general Win XP or later system -- but it's possible to have a very fast reliable way to run 95/98 software with necessary tools (Firefox ...) to support it.
The same probably is true of other make machines with chipsets supporte