The only reason I see why people would post on the currently listening to, is to discuss music, or to find out new music, really. Most people seemed to use it to up their post count is all..
In my opinion, most people who get tattoo's, not saying everyone who gets them, is because they have a meaning too them. I personally don't have one, but my brother does for our other brother who has passed, and so it doesn't really depend on what that tattoo looks like over time, but the reasoning behind it, and besides, a very detailed tattoo just look cool, so when you're around 20ish, it will look cool, and the reasoning will behind it stay there much longer then the details.
(I haven't posted since about December 08'. So, that'd be why. :))