I'd be willing to bet that plenty of these diskettes are being bought for students and classes by schools still maintaining older computers with no immediate US

I'd be willing to bet that plenty of these diskettes are being bought for students and classes by schools still maintaining older computers with no immediate USB functionality (concerns of the costs + problems associated with these could weigh in), or no suitable intranet structure available - think smaller low/intermediate elementary grade schools etc., using computers as tutoring equipment with educational software, rather than "leisure surfstations".