LOL.
I will bargain no matter what. I don't care if its a 1000 bike priced for 50 dollars. I will even offer 49 dollars if only for the fact that I want "something" off the asking price.
Whenever I browse CL, I will often fully ignore ads that say "FIRM" on pricing even if the item is priced reasonably. That really is funny that someone would say buying something off of CL without bargaining is the way it should be.