Bad example. SpaceX is one of the few companies where a lot of people would gladly work even for free. But yeah, I see what you mean.
(Also, I wouldn't discount the knowledge of tinkerers / hobbyists - they often know much more than their peers doing the same stuff for money, because when you have such a hobby you're by definition motivated to learn and understand. A lot of tech jobs (especially programming) are done by people who were force-fed some basic education and then kind of ended up doing it because they need the money.)
Back to the main point - it's not "I provided value to you and would like to be compensated". It's: "I created something that I say will provide you value, and for a chance of taking a look at it I demand you first talk with this random salesman (who is 100% totally legit and trustworthy!)". I.e. it's asking one to at best waste their time (at worst to hurt themselves seriously) to have a chance of viewing something that may or may not be of value.