There was a great response from a member here. I do not remember his name. Or exactly how he said this. Though I am doing my best to match his meaning.
What he said is that he never charges for the meet and property walk with the customer. It gives him the chance to learn what the customer wants verses what the customer wants to spend. It also gives him the time to sell himself to the customer as the person best to do the job for them.
While doing the walk around he points out suggestions and approximate costs. When the walk is over he knows how much the customer wants to spend and want the customer wants. Then he tells the customer that the next phase is to commit to drawing up plans an the cost for the design work.
At that point it separates the tire kickers from the buyers. The time spent was worth the time to find out what the customer wants so he does not design something that will not like.