I'm sure someone has codified a law that basically says "thing is cool when I discover it, but it is uncool when the next 1000 newbies behind me discover it".

A really good example of this is this blog post: http://scobleizer.com/2010/12/22/an-industry-challenge-build...

translation: it was cool when I started going, but now that all you "little people" are coming, it sucks.