“We don’t believe in the star system. We want the focus to be on the music. If we have to create an image, it must be an artificial image. That combination hides our physicality and also shows our view of the star system. It is not a compromise - Daft Punk”
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If you have watched Interstella5555, you’ll see this (funny):

Almost everybody wants to be a STAR. But do you think you can hide from STARDOM? Ask Daft Punk.
“We’re trying to separate the private side and the public side. It’s just that we’re a little bit embarrassed by the whole thing. We don’t want to play this star system thing. We don’t want to get recognised in the streets. Yes. Everyone has accepted us using masks in photos so far, which makes us happy. Maybe sometimes people are a little bit disappointed but that’s the only way we want to do it. We think the music is the most personal thing we can give. The rest is just about people taking themselves seriously, which is all very boring sometimes.”

Oh yeah, I love Daft Punk… and Darth Vader too.
Source: wiki