I recently reported a couple a post on an otherwise normal thread, were the post was possibly an advert for a completely unconected product.

I then went to post a hopefully helpful reply directed at the question the OP had asked, only to find that the thread had been deleted - presumably by a moderator in response to my report.

Is it normal for a single reported post to close the whole thread - this denying the OP and other users the otherwise useful information in the thread.

I would have throught that a proportionate response would be deleteion of the suspect post - and possibly a ban for the user making the post.