Storage unit rental went from $90 in 2014 to $110 about 2017, but then was acquired by CubeSmart which is publicly traded: now $241 per month. I know the local taxes and they have stayed about the same all those years.
I had a storage unit for a while until I realized that the monthly bill was more than the value of the contents.
For every one of you there's a few people using it as business storage and dozens of people who are dealing with living situation stuff (college housing vs apartment, house closing timing, job relocation, house renovation, etc, etc, etc) that trade in and out of units on like a 1-2mo timeline.
Source: Almost bought one.
I’ve even offered to pay for several years in advance at their “current” rate, and they won’t accept it.