My
thought is with this section being titled "Tutorials" it leaves it open to any discussion about tutorials. So if someone asks if you're interested in a new tutorial or letting you know that they are in the process of writing a new tutorial or discusses a tutorial that another lampworker has written, I guess that's a matter of opinion on whether it is an intent to promote or spam or pimp or just discuss.
But since the section isn't specific as to what one can discuss then I guess it leaves it somewhat open.
Maybe instead of having one subtitle for Tutorials for Sale then there should be another subtitle for Tutorials for Free and the regular "tutorial" section can be left open for "discussing" tutorials. That way you know where to look for what you're looking for and you can ignore discussions that you might find as being "spam or pimping".