Would you work with someone who obviously sent the job to a lot of contractors?

So I had this person that's had me quote out 3 different, very complex jobs, then be surprised with the quote. In each situation I've gone out to look at the job, given my professional opinion, detailed quote and she's passes on the work. They keep reaching out for quotes. Now her co worker is reaching out for quotes. Do you either:

a) Entertain the work because it's an at bat

b) Do nothing

c) tell her she needs to pay for me to come out because she keeps asking for quotes and taking up time