He sees a thread with an item. He finds the item cheaper somewhere else. He wants to know if it is bad to post in that thread that he found it cheaper somewhere else. "If the price is too high, don't buy it" seems to fit perfectly.
You missed the part where the original poster said that HE was NOT interested in buying the item only that he was wondering if he should alert others to the lower price available elsewhere.
The central question in the thread is whether it's ok for people to play price police or not?
Number one it's against the rules, number two it creates bad karma in a sense.
HOWEVER - I also feel that anyone who is selling anything should be prepared to handle any questioning of their pricing. Live by the sword and die by the sword so to speak.
IF you want to use a FREE public message board to advertise your stuff then you should also be prepared to get comments from "the public".
I make this OPEN INVITATION to EVERYONE on AZ.
If ANYONE would like a justification of my price on anything I post then feel free to post your questions. If you want to post in one of my for sale threads with a link to another brand of case that you think is a better value then go ahead. Just be aware that if you do I will probably rip it to shreds in front of you as to why I think my stuff is a better value.
And if you want to link to any other seller of my cases who has a lower price please feel free to do so.