The longer a Stack Exchange site has existed, the more questions have been asked, and had good answers given, the harder it is to find questions which are not duplicates of questions that have already been asked. I haven't been on stack exchange a terribly long time, but I've already seen a lot of questions marked as 'duplicates' because they are too similar to questions already asked. Presumably the people who asked those questions gained no reputation points, since their questions had already been asked.
I've been hitting various stack exchange sites for about 6 months or so getting all sorts of handy answers to questions that other people had asked before me, and it's been super helpful, but because so many questions have already been asked on most sites it has also meant that I haven't had much reason to stick around and participate. A lot of times I've found the answer to the question I want, done what I needed to do, and then closed the browser window. In many respects, that has been fantastic!
However, I can also imagine that from the point of view of someone wanting to participate in the community, this is something which could make getting enough reputation points to participate in various respects seem quite difficult. For example, because in many cases I just find the answer I need and then close the browser window, I quite often cannot vote up a really good answer that has helped me. I'm not saying this is necessarily a bad thing (maybe we want high barriers to participation to prevent people who don't want to put in the effort from joining), but I am curious to hear from people who have been here for a long time about whether they've noticed that this is a sort of a stack exchange trend/issue? Does it become a little cliquey over time?
Perhaps this is less of an issue for tech-oriented stack exchange sites, where new questions are always coming up because of the rate at which tech changes, but philosophy isn't such a fast moving thing...