Unwiseness used in a sentence

Unwiseness in a sentence as a noun

I am having difficulty finding strong enough language to communicate the unwiseness of this business model vis-a-vis accurate worries like "If you’re not careful, you may end up spending an exorbitant amount of hours on a project, driving your hourly rate into the basement." All the words I'm reaching for seem hostile and yet they do not nearly capture the scope of how bad of a decision this is.