Has anyone looked into pool service routes as a way to build a service business with recurring revenue?

Seems like the industry has some good things going for it, recurring revenue, essential business, simple operations, low startup cost, highly fragmented. The only cons I can see from here are low overall industry growth, managing of lower wage employees, low barriers to entry.

Businesses look like they trade for 3x earnings, with a 20-25% net on revenue, and routes trade for 12 mo revenue providing a direct route to growth or raising capital if you have a good marketing machine.

Is there something I'm missing? I did a search and didn't find a single post here about this industry.