I think there is more than a little addiction to it... the preparation... the thrill of the hunt with no certainty of success... then da-daaaaa! That's it!!
It is truly marvellous indeed and one in the eye for people who think the internet is a big waste of time - this is genuine documentation of things that have never had their images made available to the world at large, thanks to the immense time and effort put in by rock art fan contributors.
I love the latest posts by Rockrich, the little stones look like animals or something hiding in their nests of grass.