money! just production costs I'd say. I took a 3D design class forever ago and they made us get Zip disks, and if you wanted to work on stuff at home that meant you needed a zip drive. My dad (RIP) bought me a drive and I'm somehow still touched as it was a reasonably big purchase at the time for a slacker 18 year old doing 3D design at a community college
Not a 3D designer now, finally went back to college for something else in my 20s.. anyway, rip my dad and rip the zip drive, they were cool. 100mb wow