There is also another thing - and I'm surprised that noone mentioned it yet. Format compatibility. Reels can be "read" even after 50 years without problems here, but can you say the same about computer data? Ever tried to run 20-year-old program on modern system? Or imagine that you have to use those big 5+ inch floppies today - do you still use that obsolete drive in your 'puter?
Just like zombie said, it would require them to periodically "update" the hardware/software format the data is stored. And that costs $.