Of course, there might be something to be said for pre-recorded performances — Robbie Williams sang live on Sunday's show, and look where it got him.
He is trailing a long way behind Alexandra Burke in the singles chart this week, and she is said to have mimed her performance on the same programme.
Her single Bad Boys, with Flo Rider, is outselling Robbie's Bodies two to one in the midweek charts.
X Factor bosses confirmed that they didn't think Cheryl would have time to flit between her seat on the panel to the stage in time, so encouraged her to pre-record.
Yesterday the Geordie singer admitted she was "absolutely terrified" about her solo debut, adding: "The nerves started weeks ago. It's really here and happening.
"I love performing but I've sat for weeks judging people and now I'm putting myself out there to be judged."
Chez also spoke of her desire to become the new Simon Cowell, spotting talent and then helping them become stars.
She said: "Developing talent — I love it. I love the buzz, it's like a rush. It's like what my team say when we come off from a Girls Aloud performance.
"Some have watery eyes if we've had a good one and are like, Oh my God, I was so proud of you'. I didn't really get it until I did the show and now I totally get it, to the point where I think this is where I want to go."
