The singer-songwriter - who describes herself as a socialist - also labelled groups like One Direction "robotic" when they perform without a band onstage.
"Because I'm a socialist, I think it's disgusting when Madonna and co set ticket prices at £300," she told The Mirror. "I don't believe in elitism.
"I think a lot of artists now don't have a proper band behind them. That allows you to be more spontaneous, and mix things up.
"A lot of the time when you go to the shows of acts like One Direction it just sounds like the album, a pre-recorded gig.
"There's no banter between songs, it's all robotic. It's sad."
She also slammed Prime Minister David Cameron and the Conservative party, saying: "I vote Labour and can't begin to acknowledge anything good that comes from a Tory.
"I wouldn't allow David Cameron to one of my gigs… although I suppose if he paid for a ticket, I'd let him in. And I'd be civil.
"David Cameron just looks like an idiot and I can't praise anything his government does. Even the recent gay marriage laws they approved.
"In my mind, two consenting adults should be able to marry each other without there having to be a discussion about it in the first place.
"So I'm not going to start praising him for that because it's standard to me that this should be allowed to happen."
Faith is nominated for 'British Female' and 'British Album' for her second LP Fall to Grace at tonight's Brit Awards (February 20).
She recently admitted that she doesn't expect to win an award, saying that she is a "realist".
Photo gallery - behind the scenes at the Brit Awards 2013:
Copyright: John Marshall JME