That's a lot of assumptions made about people you know nothing about ... maybe that says more about you than about them.
Maybe you have a fast car but can't drive like a racing driver, a mountain bike you only ride on asphalt, nice running shoes but you won't win any races because you're not in very good shape ... should people demand that you give up those things because you suck at using them? Or are they maybe just "status symbols"?
So, when you see someone.. maybe even someone like me, with a 5D II and a 7D, you may expect some particular quality of their photos. I'm somewhat of a newb compared to a lot of the guys on here and I feel self conscious posting images that are not up to par with the potential of the cameras I own. Now, take someone with the very same equipment and have them put in zero effort whatsoever. To me, it's annoying.
Maybe some people love wasting money - that's cool, but I'd rather "grow into" what I have than buy something "because it's 18 megapixels and Best Buy said it's awesome"
Again, to me.