I'm seeing more and more where an offer is put out there, possibly fraudulent, and then the thread gets locked. This usually happens before any negative comments occur or follows with a lock as soon as any replies are not supportive.
Historically, anyone selling something and then locking their thread (while the offer is still valid) is up to no good.
Here's an example:
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https://bitcointalksearch.org/topic/chase-exchange-3500-closed-115531In that instance, the title reads "[closed]" but the offer still appears to be open. Neither the thread opening post nor any reply says that the offer has been withdrawn, and remaining yet is the solicitation to PM to do the deal. The thread is locked so nobody can add a bookend to confirm the offer is no longer open.
There was another similar thread like this today for something that seemed shady but the thread was locked after just the first post. I had reported it but I can no longer find it.
I don't necessarily have a big problem with them doing this (locking), just that it isn't easy for a person seeing the page to see that the offer was made but then a lock was applied where no further replies by the community can be made.
If there ws a big read indicator at the top that reads THREAD IS LOCKED, then that would prompt a person to question why a thread with an open offer is locked.
I was trying to think of an alternative way of preventing this. Perhaps removing the ability to lock a thread by those with a lower post count or those recently registered (in past 30 days, perhaps). But there are just way too many valid reasons why they should be allowed to lock their own threads so I don't think restrictions are a good idea.
So simply giving locked threads the scarlet letter is probably sufficient.