I'm not the OP but for me it's connectivity (my home connection can be flaky at times) and maintaining a server with all the updates. I'd rather do it on shared hosting.

I can see that but if I were going to put significant money towards a subscription service, I'd rather try to fix my home connection with that money (granted that this may not be feasible in some circumstances, but it is for the vast majority of people)

Nothing wrong with a home server. In fact, I've already gotten a home server running, and I save my backups there. It's just that I don't quite trust my crappy apartment internet connection enough to make it as the only cloud drive. I might suddenly need a file when I'm out, while my computer is offline.