Assuming you're not trying to level up your personal epistemic practices in large part because it's fun, and a more interesting hobby than flower arranging (or whatever), then my general model for the best that serious rationality training can be expected to deliver is a boost in your exponent that may be worth the up front cost of time spent studying.
With that in mind, it would not surprise me if a few people from this community ended up as billionaires 40 years from now (or maybe winning a Nobel in 25 years based on work done 10 years from now?), but I wouldn't expect there to be dramatic impacts right away, and I wouldn't entirely attribute the long term positive outcomes to the affect of the community so much as to the dramatic filtering that participation in the community represents. The fact that a number of people here use LW for as their "procrastinating distraction" indicates a lot about their character that the site isn't causing so much as revealing.
Learning to read the right books at twice your previous rate using half the time doesn't change much in the short term, but it means that 20 years from now you're much more likely to be exceptionally knowledgeable in your chosen subjects, and the subjects are likely to be important to whatever it is that you actually care about at that time. Also, a lot of what pragmatic clear thinking does is simply make disasters less common so that personal growth trajectories (net wealth, learning opportunities, personal mental health, social networks, etc) hit fewer speed bumps.
Learning to read the right books at twice your previous rate using half the time doesn't change much in the short term, but it means that 20 years from now you're much more likely to be exceptionally knowledgeable in your chosen subjects, and the subjects are likely to be important to whatever it is that you actually care about at that time.
This reminds me of that famous essay which I first read a few weeks ago, You and Your Research. Specifically the part where he talks about how a little additional study per day adds up over time.
Recently there has been a couple of articles in the discussion page asking whether rationalists should do action A. Now such questions are not uninteresting, but by saying "rationalist" they are poorly phrased.
The rational decision at any time is the decision, given a human with a specific utility function B, and information C, should make to maximise B, given their knowledge (and knowledge about their knowledge) of C. It's not a decision a rationalist should make, it's a decision any human should make. If Omega popped into existence and carefully explained why action A is the best thing for this human to do given their function B, and their information C, then said human should agree.
The important question is not what a rationalist should do, but what your utility function and current information is. This is a more difficult question. Humans are often wrong about what they want in the long term, and it's questionable how much we should value happiness now over happiness in the future (in particular, I suspect current and future me might disagree on this point). Quantifying our current information is also rather hard- we are going to make bad probability estimates, if we can make them at all, which lead us into incorrect decisions just because we haven't considered the evidence carefully enough.
Why is this an important semantic difference? Well it's important for the cause of refining rationality that we don't get caught with associating the notion of rationality with certain goals. Some rationalists believe that they want to save the world, and the best way to do it is by creating friendly AI. This is because they have certain utility functions, and certain beliefs about the probabilities of the singularity. Not all rationalists have these utility functions. Some just want to have a happy home life, meet someone nice, and raise a family. These are different goals, and they can be helped by rationality, because rationality IS the art of winning. Being able to clearly state ones goals and work out the best way to acheieve them is useful pretty much no matter what those goals are. (pretty much to prevent silly examples here!)