When you chose your house there were presumably several options with different amounts of storage space at different price points. You could just treat the addition of a storage unit as increased granularity between those housing options.

But the stuff I use occasionally (like camping gear and car-fixing/woodworking tools) would not fit also into that same apartment, nor would my collection of hobby-related stuff like my (small, but non-zero) collection of vintage audio and computer gear.

I mean: I'm not hoarding MicroSD cards here. I, like many others, have things that take up space.

In order to keep these seldom-used things out of the way while maintaining the hope of having a tidy, presentable home, I need a place with a garage or a basement or an extra bedroom -- or a storage facility. Those things all tend to cost extra.