You should absolutely display the price of anything you are reviewing. It’s the first step for a potential customer to decide if they really want to pursue it. Everyone’s valuation varies wildly and there’s nothing more frustrating than playing the email game with a company for a couple of days just to learn it’s twice as much as you thought it was. Save people the hassle by starting here.
I don't disagree but I've also been in many scenarios where people hear a number and run with it like gospel causing more grief for customers and businesses alike which isn't helpful to the process either. I think both can be true.