All I'm saying is don't be too concerned with the iTunes chart as that isn't the chart that matters.
iTunes matters quite a lot actually. Physical CD sale charts are archaic and hardly reflect any artists sales at this point in time. The music industry is just being stubborn in its old ways and has still not fully embraced the digital market. They are making the initial steps towards doing so though, which is a step in the right direction.
People download now more than they actually go to record stores to buy CDs. So Vanessa performing well on iTunes is incredibly important, just because her sales on iTunes don't show up on "charts that matter" - according to you, doesn't mean she won't be any less successful. It's quite far from the truth actually.
As an example, Utada Hikaru, one of Japan's top selling artists has had over 7,000,000 downloads on iTunes of her latest single, making it the top selling single on iTunes from any artist around the world, and those figures aren't included on any official charts, but that's a huge fucking success, and tons of fucking money to boot too.
iTunes matters a lot.
We live in a digital world people.