Plumbing demand is urgent and impatient. A homeowner with water on the floor calls the first two or three companies on Google, and the first one that answers or texts back usually gets the job. If your phone goes to voicemail while your team is under a sink, that call is gone in minutes, not days.
The second leak is quieter. Bigger jobs like water heater replacements, repipes, and sewer line work need a quote, and quotes that go out without follow-up often sit unanswered while the homeowner gets two more estimates.