The "Wall Observer" is a great example , I do post there once a while, it's nearly impossible to find 3 consecutive quality posts there, and every time you hit F5 you see new post/s coming in,also notice that signature is disabled there, so nobody does get paid for posting there - it makes me think that people don't shitpost just to get paid, they either do it for fun or simply do it because it's all they know !
I also think that many people find it hard to blend in topics that require some sort of knowledge, so the only place for them to post would be those mega thread where they can literally post anything they want and nobody will bother telling them hey "stop spamming".
we discussed a similar issue on our local board and one of the members suggested that we should focus a bit more on "General Topics" to encourage the average members to participate , and he does make a lot of sense, because come to think about it, most people don't care/know about the Technical behind BTC, wallets , mining etc.. all they want to talk about is BTC price, how to make money , what ICO is going to the moon, and despite their shitty posts, I do think they deserve a place here, so why not help them blend in by actually creating "simple" content which would allow them to actually participate in something they know?