There is a LOT of difference between any real Commercial grade equipment and Residential equipment...
A commercial mower will give thousands of hours service life...
To address the OP question... "Who can buy a commercial mower?" Typically it is a city or municipality, a golf course, or lawn landscape business... and none of them do it for the idea of wasting money, if you need rugged dependable rebuild-able equipment...it is the least expensive in the long run.
If it could be done with cheaper stuff ... it would be. :smile:KennyV