The problem with asking about the decision to quit itself is that it's very localized. Not everyone can (easily) quit just because they're being paid less than market rate. And some people can quit because their office stocks Coca Cola instead of Pepsi.
There are a great deal of factors that go into resignation, and generally you can bet all of those issues aren't laid out in the question we get. "Should I quit" is usually asked about the straw that broke the camel's back. That straw might be a legitimate issue, but that issue itself rarely calls for an absolute "Never ever quit because of this" or "Quit right now and run!"
It's just a bad way to phrase the issue. What if there's a super simple way to solve the problem without quitting? Well, too late, I phrased the question so solving the problem is no longer an answer. I've also prevented the question from being useful to others in a similar situation who can't just quit willy-nilly (and some who can).
Another problem is, if the answer is "yes, you quit", it's often left in an extremely short answer that, at best, really only helps the asker. And someone always posts a "yes, quit" in these sorts of discussions; it's free rep! Find a question where bad working conditions are apparent, say "Hey, you should quit!" and ride the wave of "YEAH RIGHT ON". That really doesn't help anyone, it's barely even an answer, just a suggestion (a potentially dangerous one which really shouldn't be treated lightly).
A recent one is https://workplace.stackexchange.com/questions/4003/nepotism-fight-or-flight, but we've had plenty of these:
Should I quit because I'm not up to the job?
Should I quit my job because I lack experience?
Is it unethical to quit just before a project that I'm the only one suitable for begins?
Quitting an exploitative job
New Job and a big Mistake with Company Culture
https://workplace.stackexchange.com/questions/3843/quit-masters-and-work (2K rep users only) https://workplace.stackexchange.com/q/1572/42 (2k rep only)
Can we work with these questions? Do they need to be rephrased somehow? Or is this topic inherently too problematic to work with?