Yes. Isn't this something code review catches? :)

Sometimes, but not nearly as reliably as a static analyzer. But I'm assuming the unstated point you are sarcastically implying is "you don't need SonarQube" - maybe you're trying to say something else.

WebXL makes no sense, because that's comparing oranges to apples.

Presuming there is an infinite pool of programmers who tirelessly work for a low price?

I'm really curious what's your line of thinking here. Could you elaborate?