Well, I didn't buy the digital copies. Pirating FTW!!
But I do find them useful if I need to go to the library with a few textbooks, and instead just taking one or two and having the rest on my computer just for reference.
If I didn't have to use plain old Acrobat Reader to read them, and maybe something more intuitive for long reading, like bookmarking, highlighting, etc. I might be able to deal with it then.
Otherwise, I'm fine with a physical 1500 page text book to lug around. Maybe when I'm older and worthless, I'll start reading books out of nostalgia for when I should have studied in college. Right now, I'll just keep pretending.