Actually PHP updates! As far as I know I didn't ask for it, they are making it so that my shop doesn't go offline.
The last two upgrades went by with no input from me at all. And the shop stayed up and reachable.
What I see from this, is that my shop is online, it's up to date and it keeps working on it's own with no hassle from me.
If I host my shop myself and want to have all these features (or something like that) than it will cost me at least a bit of time, some knowledge and money.