There was a study in Canada by Tudor-Locke, et al (2011)  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3197470/ which revealed, "Normative data indicate that healthy adults typically take between 4,000 and 18,000 steps/day."  This doesn't tell us how many people in the United Sates walk across carpet every day, but many office buildings have miles of carpet with a lot of people stepping 1,000's of times every weekday.  Even if an office building happens to not have trouble with geese getting feces on the parking lot and walkways, there is still a lot of dirt being constantly tracked in and stomped into the carpet.

Most office buildings need to have their carpet and rugs cleaned.  Hard flooring in the office setting leaves the endless sound of voices echoing throughout the day, so many office buildings still have carpet.  Carpet cleaning is still in demand.  Especially if the operation is already cleaning restrooms, offices, and common areas for a customer, then it makes sense to periodically deep clean the carpets in the same building and get out what vacuums are not able.  Cleaning companies, let's speak up and make those carpet cleaning sales!