I feel your pain brother.
I just read a post from a Habs fan saying Carey Price (with 0 retention) for Barzal+Pulock+Halak+NYI 1st+CGY 1st is a fair initial asking price for his goaltender.
It's almost impossible to discuss trade value because too many HFboards posters are simply concerned with only getting ridiculous overpayments back for their expendable veterans, willfully ignoring things like drops in production, contract status, and just overall lack of interest when they hurt their "my expendable player has humongous trade value" narratives.
Martin Hanzal got a 1st+, therefore my 3rd line center is easily worth that. Erat was traded for Forsberg, so trade your blue chip prospect for a veteran I trash regularly on my team's forum. My guy had a really good season back in 2012-13 and it's very likely your blue chip prospect is a complete and utter bust because he hasn't hit the NHL yet, so from my POV it's fair.
I actually had an Avalanche fan tell me I was wrong about valuing Barzal highly last year because more people agreed with his "very likely a bust" assessment of the current Calder favorite, and that nobody (myself included) could have seen his success coming. The need of some people to twist everything into a "win" really gets tedious.