Definitely. And when one knows it won't work? Say that, say why, decline and cite cost to make it a success exceeds client expectations and or ability to pay.

Definitely. And when one knows it won't work? Say that, say why, decline and cite cost to make it a success exceeds client expectations and or ability to pay. When they do it on the cheap, fail hard, know that cost exceeds just doing the right work with the right materials every time. When they come back, quote them with confidence.