Why? When you post a single question that gets downvoted you don't get banned. It's only when you repeatedly ignore the rules and ask terrible questions over and over refusing to learn from your past mistakes.

There might be a discussion to be had about how to teach users what a bad question is, or how many is too many, but I don't understand why we should let people who repeatedly fail to clearly ask a question keep asking. Most people have no such problem.

In fact, when experienced posters politely point out what the rules are and where to read more about them, you start to see new posters fall into 2 categories:

   1. The people who say, "Oh, I didn't realize that's how it works. I'll update my question/do better next time/etc."

   2. The people who insist that no, it's their platform and they'll ask whatever they want however they want.

People in category 1 usually have no further problems using the site. People in category 2 usually end up banned.

And of course, there are experienced users who are jerks and don't point out rules or don't do it politely. They should not be excused. But letting new posters continue to pollute the site with terrible questions isn't going to help anyone - especially not the people posting the question.

By immediately framing questions as either good or bad you've shown that you're part of the problem. If someone's question doesn't make sense to you, that might mean you're not qualified to answer it. You don't have to weigh in on everything.

You can immediately analyze the effort undertaken by the asker. And it is worth pointing out sometimes. Of course no need to be rude.

And perhaps better ways to discourage this behavior from new users. This is no different then imagine a few programming newbies join a "Introduction to Programming" class taught at a college by seasoned professor and assisted by graduate teaching assistants. What if TA's start discouraging new students from continuously asking mundane questions? Do the instructors care only about the "performance" of average students in the class so they can go back to their department at the end of the semester and show they have hit a satisfactory passing rate? Or they care about that every student walked away with a good understanding of programming at the end of the day?