Well, if they dont they get fired :) and I dont like to talk about the business doing things, just working this weekend because they didnt listen for the last six months.
Engineers think (sometimes incorrectly) they could do the job of the business people, in a pinch. Business people know they can't do what an engineer does. This dynamic contributes to why business people respect engineering on engineering decisions, and why engineers don't respect business people on business decisions.
A lot fewer engineers talk about how they like to listen to business people.