It sounds like everyone is ganging up on Buffo just because his hobby experience isn't the exact same as the rest of the posters. Modeling, Painting and Collecting are all very important parts of our hobby. Gaming is up there, and sure its #1 for many people, but because someone enjoys the visual and dramatic experience that 40k offers I don't feel like he's necessarily wrong in denying that guy with proxies, unpainted and primed marines a game.
Secondly, experienced games who use proxies to powergame are every bit as bad, and in most cases, worse than hobby elitists. There is nothing wrong with the Space Marine Codex, the Space Wolves Codex or the Blood Angels Codex that should make you want to jump ship. If you play Chaos or even Black Templars / Dark Angels (pre or post FAQ) then I understand it a bit better because your costs are wrong, and GW has left you in the dust compared to the 5th ed books.
Third, 40k is a social thing. People play the game because the game is fun. However if the way you play the game is trampling on my experience than I reserve the right to not play you. Its the same way with every hobby - its not elitism - and if it is then who cares. I'm not going to expect a tournament fisher to come catch bluegill in my pond, nor would I expect every person in the bar to want to talk with me just because we are all drinking. It's just the way the world works.