Whatever the truth might be, either I know a bunch of otherwise honest and down to Earth people who are lying or delusional about this issue, or there is actually a screaming opportunity for making money on easy arbitrage that few people bother to exploit, and even they only partly and incompletely.
Otherwise whip smart people tend to be delusional about gambling. This applies also to the stock market. Gambling is a minefield of meaningless patterns which trigger our pattern detectors. I presume that's a large part of why it's so fun.
Some people reading that will say, "yes, I already know that for most people gambling is a pandora's box of rationality-killing delusion-inducing spurious patterns, I've incorporated into my thinking, so belaboring the point is just wasting my time". But what I have found is that, however much I think I have incorporated that insight into my thinking, I did not incorporate it fully enough.
My guess about your smart acquaintances is that they have been lucky and are delusional. As for why they don't dive into their delusion, quit their day jobs and destroy their life savings, which is the point of inconsistency that's puzzling you, it may be that on some level they suspect that they may be delusional.
Point of clarification: I am not saying that it is impossible to do what is proposed here, which is to systematically study the game and come up with a winning strategy. This has been done on multiple occasions. My guess about your acquaintances is based on your describing them as "casual" players.
Reading the discussion here, I got the impression, which is consistent with my prior expectations, that with the systematic method proposed in a given hour you only win, on average and with a lot of variance, a small fraction of the amount that you bet. Whereas what you seem to be saying is that your friends are claiming enormous wins. Such big wins are probably mostly due to luck. The drip, drip, drip of slow and unsteady profitability of a systematic method applied over an extended period, does not seem to be what your friends are talking about. In short, their wins as you relay their descriptions sound like free money, whereas the systematic method (which is all I really trust to work) sounds like a job.
Otherwise whip smart people tend to be delusional about gambling. This applies also to the stock market.
Yes, in fact it happens that some of the same people I know claim to be able to beat the stock market too. I think your theory is probably true: both in gambling and on the stock market, people get deluded by occasional lucky windfalls and fail to keep track of the big picture. Yet few of them actually get deluded to the point where they'll go ahead and bankrupt themselves; the others remain rational at some level and refuse to actually put really si...
Related to: Problem of verifying rationality
We're excited to announce the (soft) launch of RationalPoker.com! It's a new guide developed by me, Zvi, Kevin, and patrissimo detailing how to use online poker as rationality training to conquer your cognitive biases. We want our community to go from knowing a lot about cognitive biases to actually having a training method that allows us to integrate that knowledge into our habits -- truly reducing biases instead of just leaving us perpetually lamenting our flawed brain-ware. In the coming weeks, we'll be making the case that online poker is a useful rationalist pursuit along with developing introductory "How To" material that allows those who join us to play profitably.
We want to make sure we aren’t wasting our time practicing an ungrounded art with methods that don’t work. Poker gives us an objective way to test x-rationality. The difference between winning and losing in poker once you know a small amount of domain-specific knowledge is due to differing levels of rationality. Our site will be presenting the case that a strong rationalist who can act on their knowledge of cognitive biases (a defining feature of x-rationality but not traditional rationality) should have a distinct advantage. We'll be offering the connecting material between the sequences and online poker to teach you how to apply knowledge of cognitive biases to poker in a way that verifies your current level of rationality and naturally teaches you to improve your rationality over time.
Incidentally, this also presents a solution for those of us looking to earn money from anywhere with a flexible schedule that leaves time for outside interests.
We’re just getting started so please be kind! Our site is definitely not a final product yet. If you're curious about where we're going with this though, add us to your RSS feeds or check the site every few days. We hope some of you who aren't convinced yet consider playing once you feel like we’ve finally given you enough information to understand why poker is a profitable rationalist pursuit.
Also, if you sign up for one of the online poker rooms like Full Tilt using our affiliate links, the residuals get donated to Less Wrong/Singularity Institute. That way, the more poker you play after you sign up, the more money you direct towards raising the sanity waterline and creating provably friendly artificial intelligence.
We’re not counting on it, but even a very small group of us could theoretically fund SIAI in a very real and meaningful way just as a side-effect of playing a lot of online poker. I know I'm partisan, but this seems like an unreasonably exciting opportunity! So if you support SIAI and you (or your friends) want to sign up to play online poker anyway, please sign-up using our links.
Anyway, we hope some of you want to get stronger by joining us in the Rationality Dojo of online poker. You can be part of our crew of aspiring rationalists who want to increase our rationality, earn money, and help save the world -- all by playing a fun computer game with no boss, no schedule, and the potential for lots of self-development and personal growth.
So check out our site and let us know if you're interested in joining.