If that was the sole purpose of the Commerce Clause then they would have said so. The clause would have said "there shall be no economic or other barriers for trade between the states." Instead it says (paraphrasing): "the congress can regulate trade between the states". Like it or not, that's what it says, and I have no problem with truth in advertising.
You read that to say that congress can control everything bought and sold in the United States?
/johnny