There's an article on TV guide that says Mark Burnett took the 4 judges and Carson out drinking before they started filming. The agreement was that "none of us watch those reality shows and none of us need to do this, so let's make a reality show about real talent." I don't think they'll ever bring anybody on who can't sing since the judges won't waste their time.
Adam is also proud of himself for being a good coach. He didn't think he would be and is a little surprised at how involved he got in the process.
And they all drank a lot.
I might watch X factor unless it's on opposite the Sing Off. Ben Folds will beat out Simon anyday for me. Plus, I love the groups they have on the Sing Off which is another case of only showcasing people with real talent.