Apparently, OP is not particularly interested in getting the job. The point of this post isn't entirely clear to me.
It depends on what job you're referring to. A job that pays and keeps your profit margin and revenues consistent, or a job that could potentially end up costing you way more than you thought?
He's pointing out that many clients come to him with completely unrealistic views on developing, and yet are asking an expert (him) to advise him on how to properly develop something.