I tried to think of what I would do if I were in the shoes of these "independent researchers". First of all, I certainly would NOT post my ideas in, of all places, an OPEN forum where someone, with more resources than me, could easily scoop it and run away with it. Revealing it openly on something like this is extremely foolish, especially if it has any degree of validity.
Secondly, why would I want to do that when what I need is someone who is an expert in the particular field that the idea is in. If I have a theory of superconductivity, I do want someone in that field to scrutinize my idea. That person not only have the knowledge to in that particular field, but also is up to date on the state of knowledge of that field so that he/she can tell me "Oh, someone did that already" or "Oh, we already know that is not important". This means that I have to not only find such a person, but also verify his/her credentials to have any confidence that this person is legit.
Both of these points argue against posting one's idea on an open forum. It just makes no sense to do that if it has any degree of validity.