I think that's not quite accurate - it's been two or three people making the initial posts, and they have been useful information. I'm not sure why you'd cast aspersions on their motives - it was to provide useful information, and it's a basic human emotion to want to do something good for other people. You might get told you're a 'do-gooder' or 'peacocking' by those more self-centred, but it takes all sorts.
However, it does provide a bit of the conundrum when the forum is calkled 'beginners' questions', but if you see that as the obvious place where beginners with questions will come, having some already answered is fine. In fact, on BQs on DPReview beginners would sometimes be castigated for asking questions which had already been answered by the few miserable ****s that sometimes frequented that forum. What else were they to do when there were no sticky threads, and the site software didn't make it easy to find stuff? So, what I did was put a sticky thread with links to the answers, so beginners could find them quickly - and the are answers to common questions.
The other problem with BQs on DPReview was that it would be filled with arguments about which answers were correct or not. To solve that one we've made BQs curated space and introduced another forum 'BQ DIscussions) to which all those discussions get moved.