Price Police only get on my nerves when they don't validate their opinion with facts on other sold like items. I have no problem with using prior sales of same condition pins to get apple to apple comparisons and inform potential buyers. If I am selling a HEP MM, I don't care what a Popeye with a shop job sold for 2 years ago, and other than a bump, it really adds nothing to the thread.
Price Policers can help buyers from overpaying and inform buyers what to look for. If you post in an open forum you can expect that to happen. It can also help sellers make a case on why they posted the price they did. The internet makes it pretty easy to price machines, so if you are asking a premium, be prepared to explain why.