And that's because this past year, LSU won the national title, yet I think most SEC fans thought UGA was probably the better team and would've beaten LSU.
The other conferences know that the SEC would be able to prove its strength in a playoff system, and they don't want it. The ACC also seemed to be behind a 4 team set up for the same reason. It isn't as strong as the SEC, but they are a conference where they don't have one or two programs that simply dominate every year that have an easier route to the BCS title game.
In the Big 12, it's Texas and OU that are head and shoulders above the rest. In the Pac-10, it's USC. In the Big 10, it's Michigan and Ohio State. And the Big East teams realize that their best shot at a national title is to go undefeated in a weaker BCS league and only have to win one game to get a title. If they had to win 2 or 3 games, there is no chance you'd ever see a Big East team win it all. They know that.
By the way, here is the quote from Jim Delany (Big 10 commissioner):
"There's a strong sense in that room of the slippery slope view that there's never been a collegiate or professional playoff that's stopped at four teams."
It's exactly like I said. They realize that if they allow a 4 team playoff, all arguments against a playoff will be eliminated, opening the door for a future 8, 12, or 16 team playoff. That's what they are really trying to prevent, because the last thing we'd want to do is have a championship settled on the field.