Reminds me of a fellow who asked me to come out and do a site survey on an apartment complex for all sorts of signage (parking, wayfinder, no trespassing, etc.) I told him I charge $90 for the trip, no free estimates, the $90 would be credited to his job if he went with me for the work. Sure, OK, he said.
As soon as I arrived, first thing out of his mouth was "I had another sign guy out here and he didn't charge me a survey fee, you shouldn't either." Jumped back in my van, and adios...