It’s kind of a pain to go to the drug store at 9pm to Print your kids solar system project. Just saying
Give us another couple thousand years or so.
People have legitimate reasons to want their own high quality color printers, even if that is its own pain, too.
I think the disconnect here may be that most people rarely print glossy, so stopping by a store isn't a big deal for the vast majority.
If you're really printing glossy on short order demand then of course owning the machine might make sense.