>>162370898>every so often though
That still means that 1/1000 /a/nons, if that, will see it. 4chan is a big and complex place, there's tons of things you can be a long time lurker and still never hear of or see. If you haven't realized that yet then you are the newfag.
It's not about 'lurking moar', it's about understanding the level of exposure something gets, which is easily quantified. Just look at the archives. No really, search the terms "ass fang/ assfang" and "butt fang/ buttfang" and count how many times it occurs per week. There re 10,000s of posts on /a/ every week, is it really that hard to believe that a person can still never see / notice it being mentioned?