Complaint / review text:
Vendors must pay $35 for 20 credits. It costs 2-3 credits to send a rate quote to a person who requests one.
If you get 30 quote requests a day, you will use 60-90 credits per day a day just to send your rates to a potential customer. That will cost anywhere from $105-$175 dollars a day! A day! If they don't hire you (which they never do because they are not 'real' customers—I think most of them are competitors who are looking for your rates and other details), you lose those credits.
The requester cannot view the vendor's profile until AFTER the vendor has paid to send a reply. The requester will be sent dozens of vendors to choose from, but they have no way to view the vendors details before they request a quote.
So for every potential customer, there will be 20 vendors spending their money to reply, and only one will be chosen (that's only if it's a real customer and not a competitor). Very nice money-machine for Thumbtack, and a financial drain for vendors.