There's this answer already. Why are there high rep users not even stating why they put this comment here?
We should understand that we put this in the comments as a way to help, not confuse, the user. I would like to ask: can there be a way to have some sort of format?
For example, if it's a new question, we guide them there. Then we don't stop at that point. Instead we (the user who posted this comment) should guide the new user up until they actually posted their first question that is well bounded according to the rules and guidelines of WB.SE. Posting it just for the sake of badges and or reputation is, frankly, not needed. Just flag the question if it does not conform to the guidelines of WB.SE.
If it's a good question, then praise the new user, along with why you think it's a good question, along with the "tour" so that we can help them to post more good questions.
If it's bad, add the reason why it is bad, and at least try to help the person asking the question. Edit the question to conform to WB.SE rules and guidelines before putting the link to the "tour".
It's infuriating to see these comments on good questions. They are like chewing gums underneath your desk (if you had that problem). I'm sorry for rantíng like this, but what I would really like say is: if we want to help new users on posting great questions, we have to actually help them in the process, not just posting this comment for no reason.
As requested, here are the examples.
And another one
But this time, take a look at JBH comment, and that comment of Gryphon, which is more welcoming? Which is more helpful? I am actually all ears in this, because I do think this avenue can help new users on how to post good questions, or answers.