I just did it with an insulation contractor as I will probably spend $1-$2k upgrading insulation in my home. No reply.
When thinking about it, it happens to me probably as high as 80% of the time. I would say 7-8 out of 10 inquiries go UNanswered.
It happened with an HVAC contractor I talked to on the phone too. I told him my AC was broke and was 27 yrs old, that'll I'll probably need a new one. He said he'd come out on a saturday to look. No show. No call. I am now getting a new AC and furnace between $5-$6k this week, and he wasn't invited to bid. I guess he's too fat n happy! I think I'll send him the invoice from my new HVAC system purchase.
Other than beating them on the head telling them to read their email, I move on to another business. Maybe I'll sell them a shocking device for a jolt every time they get an online inquiry if they are too lazy to check for inqueries.