I have been stung several times with this scenario : I bid for a job (manually or through targeting) based on my location preferences. Client responds with an entirely different location (out of my range, sometimes out of state) in mind. Valuable dollars needlessly lost (on my part anyway) to basic miscommunication.
So it seems some customers just fill in the 'Location' box based on their current location not where the job will be.
I understand ambiguity suits Thumbtack's purpose but they should consider changing the descriptor to 'Job location' or something with more clarity.