Because it IS. Its a closed shop. Chatting to a WBA fan at work and he says other than the top six (and maybe throw in Villa and Everton) there is virtually f*** all from about eighth in the Prem to about HALF WAY in the Champ.
You know who will win the prem (Man U, Chelsea, Arse and now Man City) who will follow up Spurs , Liverpool, then the odd "outsider" like Everton, Villa or a real unexpected ONE OFF like Sunderland or Newcastle.
Compare that to most major leagues in the world and you'll see that the Prem is actually genuinely quite competitive. The Bundesliga is the massive exception. The Prem is far more competitive than La Liga, the SPL, Serie A (although this year looks a bit more interesting for once) and numerous others.