PageMaker was replaced many years ago, but here in the UK we still receive Adobe PageMaker files in versions 7, 6.5, 6.0, 5.0, and Aldus PageMaker 4.2, 4.0 and 3.0; from local authorities, amateur dramatic societies, small businesses and assorted individuals. Yes this is nuts, but we need the money from these print jobs. Yes we also receive Adobe CS6 files and everything inbetween. The other day I received 16 floppy disc images via email which turned out to have Aldus Freehand version 1 files on them; fortunately I have a mac with version 2.02 on it and was able to convert and save as EPS and then use something a little more up-to-date.
The aren't too many people is true, but there is enough to make it commercially viable saving old hardware & software.