I wonder if that's the reason my HVAC guy tried to charge me $700 for running a thermostat cable less than 8 feet (that I later did myself in less than 30 minutes).
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So he bid an outrageous amount. If you had said yes, he covers his overhead. If you reject it, he does something more profitable with his time.
Not to mention there's the possible, "I don't like you," fee.