Products as seen on TV

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We watch on TV different ads of wonder products such as Super Slicer, Power Grinder, Magic Pan, German V Slicer, Magic Bullet, Roto Matic, Wonder Mop, Go Duster etc. with the banner or TeleBrands. I've been watching these types of ads on TV channels like Sony Entertainment Channel, India, Zee TV etc. for more than 10 years. And these realistic ads are credible enough to grow faith in our mind. There was nothing wrong I found till now. But now I noticed that while these commercials are displayed, a cautionary message saying like this: "This is a commercial ad. The channel does not........" etc. etc. appear on the TV screen. What does it mean? Doesn't it mean that the channel authority has doubt about the effectiveness of these products? What do you say? Are they really that much effective as seen on TV or not?