While I admit a healthy skepticism concerning the anecdotal claims of any trader, I also would like to point out the false logic of the dogmatic skeptic. Because the dogmatic skeptic has an illusory sense of ingrained certainty about subjects which they don't have knowledge about, which basically includes everything that they aren't certain of, they often resort to illogical and invalid forms of argument to try to justify their illogical assertions of certainty or extreme skepticism.

Example 1: The dogmatic skeptic says that there is almost certainly no intelligent life off of this planet. When questioned further, it turns out that the only valid evidence that would ever change their mind would be if they were personally transported by a strange looking being in an advanced spacecraft to a distant planet and be allowed to explore it. Any testimony, observations, physical evidence, signal or communications from space, telescope imagery, scientific argument or other evidence would be insufficient, no matter from whom, what it is, how frequent or volumnuous, to alter their viewpoint. It is plain that they have a fixed belief, and nothing could change it except a sharp blow to the head.

Example 2: Some people uncover strong evidence of a criminal conspiracy. The dogmatic skeptic asserts that the theory is implausible (they haughtily label it a "conspiracy theory"), because if it were true, they maintain, then that implies that there are many criminals in society, which they imply is unlikely, and furthermore maintain that if it were true then one or more of the conspirators would have gone to the press and confessed their criminal acts (which is also unlikely), and then the press would have published these confessions (which is not only unlikely, but probably illegal).

Example 3: The dogmatic skeptic says that if someone discovered a high performance trading system, then they would instantly become a billionaire. If they aren't listed already in the public list of the wealthiest people in the world, then they obviously haven't discovered a highly successful trading system. This argument is patently untrue on several counts. Just for one, we don't know the name of the person who started this thread, so we don't know whether his or her name is on the official list of rich people. Furthermore, only a naive person believes that the official list of rich people includes all the rich people in the world. Most rich people hide behind trusts, foundations, etc. and don't advertise their wealth.