e.g. the general principles behind the tragedy of group selectionism, as well as extrapolating from Quirinus_Quirrell's experience and mine.

I don't believe that the Tragedy of Group Selectionism is entirely analogous, since that scenario deals with epistemic as opposed to instrumental rationality. And, while your and Quirinus_Quirrell's experiences are definitely interesting, that doesn't mean that they are representative (of course, it doesn't mean that they aren't representative, either).

I think the experiments you propose are promising (the first one more so than the second, as you said). If you could dig up some studies on the topic, or run some yourself, the results would definitely make a good Main post (IMHO).

If the way I wrote the OP or the fact that I put it in Main suggested that I had strong evidence that this is a really good idea, that was a mistake on my part.

No no, I did not get that impression at all -- that's why I originally pointed out that, due to the lack of evidence, this article probably belongs in Discussion more than in Main.