Yes. The buyer will evaluate himself. Dont flames people thread.

If he/she stated price are too high, i'm sure he will know in the end as no people post in his thread or he cant sell off the item.

About the price, to cite an example:-
A seller selling a diamond for 5million and a buyer willing to buy it.

Is the seller sell too expensive ? Is the buyer water fish ?

NOT at all. Since the both parties want to deal it. The buyer willing to buy at this price and the seller want to sell at this price.

What is the mistake if he/she wanted to sell it so expensive.

IMO flaming will just caused people frustrated and headache.
There is a 'PM' for you to use for futher negotiations and discussions.

And yes forums is a place for you to voice out your opinion freely but it doesnt mean you can mess around and disturning one's thread.

After all, it's business. There is NO certain guideline on how you to want to run you thread or business as long as it dont against the rules. A smart person would end up being really successful.

Market is so competitive nowadays, if someone selling too expensive then it would come to a result as he/she cant sell of the item. If a buyer want to buy certain item, he/she should already have some knowledge about the item or at least about the price. WHY need you to flame in someone thread stating that 'you can sell off ur item one lar' or how come so expensive' while you can do it in 'PM'.

The buyer always stated the price for certain reason and well aware of it ! He will drop the price if no buyers

MATURITY FTW !!!