Yes, we moderators see a lot of those! We've had a bunch recently--come on here, post half a dozen to a dozen posts that are friendly but really have no content, and then edit their posts overnight to include spam. We also have an occasional new poster who thinks that if he puts up 10 posts in a day with no real content, he is then entitled to post ads in the "for sale" section.

We moderators watch such posters but really can't do anything about them until the spam or for sale ad is actually posted. If you wonder why some posters, such as the OP here, disappear never to return, it's because they are banned from the forum once the spam hits. Sometimes the threads they start become excellent discussions, even if that wasn't the OP's intention! That was certainly the case here!