Moving is stressful. A thousand things are on one's mind. USpammers use confusion by posting a mountain of ads (last I checked between 300 to 400). USpam uses different pictures so in your confusion you click onto what seems to be another business.
Moving is time consuming. USpam knows you don't have unlimited time to shop around. Which is why they posted around 4,000 ads every year (for the past couple decades). Competitor storage facilities buried by a mountain of USpam can't be found unless you have time to search on line 60, or 80, or worse.
You pay more for storage to compensate the USmaggot that sits around posting USpam ads all day - against Craigslist Terms of Use.