does this kind of competion work?

Flipping through the television channels this afternoon, all I got to see was a slew of infomercials on things like colon and body cleanse and the like. I wonder why 3 channels were airing these products at the same time... although they were of different companies, so maybe that's the strategy. Increase competition and get customers to think that everyone is buying into the product to make it more legitimate. I wonder if it's working out well for them.