Speaking from experience, software for Plumbers, Roofers, Pest Control, Cleaners and most home improvement type sectors are really hard to scale. It really is an up-hill battle getting them to spend more than a couple hundred a month and the churn was so much higher than any other sector I have worked in.
You have HomeAdvisor, Angie's List, etc. who are heavily tapped into this market and understand the challenges that come along with it. We developed a lead gen, crm and follow up system targeting this sector. So many of the Plumbers and Roofers we talked to would complain about HomeAdvisor and other similar providers. How bad the leads were, that they were shared (sent to 5+ others), etc. but were not willing to pay for a higher priced offering that fixed those things. Most that were willing to invest were horrible at even answering calls from prospects. They would call prospects back 2+ days later to discover they went with someone else who actually did answer their phone and would then say it was a bad lead.
The experience gave me a much better understanding on why the competitors focus on shared leads. Hopefully at least 1 of the 5 roofers the lead is sent to will actually respond in a timely manner.