As a few others have mentioned, I can pass the cost on to the customer. What if someone only has a question? I'll put in my profile that my minimum charge is the Thumbtack cost to me, and when I bid on a job, part of my boilerplate will be to tell them to look at the pricing info in my profile, and to state that any response will be treated as an implied contract, because of Thumbtack's pricing setup. But honestly, given all the negative comments here, and the reality that Thumbtack ALWAYS seems to be a work in progress, I think we can expect this setup to change in a matter of weeks, if not days.
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