You don't see the difference in value between someone who has built a company that's making nearly $200k a year vs someone who hasn't?

In that case, we fundamentally disagree, and this discussion is fruitless.

$200K a year is shit though. Just because somebody can get to that level doesn't mean they're going to tell you anything useful for getting to $500,000,000 / year. That's why I say it is a signal, but it's a very weak signal.

There's also the problem that you don't know the value of the hypothetical "person who hasn't gotten to $15K MRR" yet. If they started their company 2 weeks ago, they probably have an MRR of $0. Does that mean that they have nothing of value to tell you? That depends on a lot of other variables.

Anyway, you're probably right... we probably just have fundamentally differing world-views. I lean towards the "you can learn something for everybody" mindset, and try to late-bind judgment on people's value as advisers until the last possible moment.