Because the problem is always the same and it is always fixable. The owner is good at the trade, the work is good, and the customers are happy. Then the phone rings while he is under a sink, and that job goes to whoever picked up instead.
None of that is a marketing problem. It is a plumbing problem, in the literal sense: something is leaking, and you can see exactly where if you look.
You call me, not a support address. I set the whole thing up, and I keep it running — you are not handed a login and left to figure out why the site is down on a Sunday.
If something I sell is not the right fix for you, I will tell you on the first call. A client who signs up for the wrong thing cancels in three months, and neither of us wins that.
The short version
You will get told where your leads are going whether you buy anything or not.