In terms of using Zip at all: Just be ware, lots of problems, mostly with 100, so if you can get all 250 you'll have slightly better luck than using any 100 stuff. Networking would be better, MO would be better, CD-R/RWs or DVDram would be better, etc etc.
In terms of "the context of zip750 in 2002: Flash drives weren't quite commonly available yet in early 2002,
CD-R was available and was growing cheaper, but I'll be honest, burning CDs isn't convenient and so I bet Iomega had this idea that the market for a more convenient superfloppy still existed, even if that market was "a drive and a handful of disks" which is a revised goal from the Zip100 scenario where Iomega was dumping the drives.
I still hate burning optical media for one-offs, unless I'm going to give someone a disc, and even today, 32gb flash disks have come down.
Removable media would likely have continued being popular if USB disks hadn't become a thing. Although, I'll openly admit that my preferred alternate reality here is that hiMD becomes the defacto superfloppy format, in lieu of Zip, but 3.5-inch MO would also have been good, just, hiMD is multi-purpose in that sense and holds a gig and that's "fine" for most people's superfloppy needs. (relative to 1.3/2.3 gigabyte media.)