I used Thumbtack once, and felt that Thumbtack was a scam. It costs me $2-4 just to send a quote. I spent about $20 sending quotes over the course of a month and never saw any business. A lot of the requests I received just seemed fake (e.g. $3000 commercial shoot requests with no details). I'd actually prefer to pay more and give Thumbtack a percentage of the deal rather than pay a lower cost upfront. At least that way they have motivation to verify customer requests.