There used to be arguments on the swap meet page. someone would list something for sale and then people would start commenting on the fact that it is wrong, or their description is wrong, etc. It made it very messy. Lots of discussion clouding the sale. Not necessary.
If you are interested in the item, the new rules are that no one can reply to the sale. Just contact the seller. You don't have to comment on it. Write directly to the seller and ask a question. That is done by clicking on their name and selecting "send a private message to XXXX"