your further discussion is spot on and does clear up the initial post. On the forum there are many people that post that all their equipment is paid for and do not have any overhead. They charge rates like the lawn boy using daddy's mower just to make some pocket change. Some are people looking to suppliment their regular job, some are semi retired, or in college. You get the point.
If I made a 40K investment I would look ROE and earning my cap rate too. Often you can get an improved ROE with leveraging and many people do not get that. Thank you for making that point. WACC i know