I disagree - for some people e.g. those with limited bandwidth it's
worth it to pay 4 bucks for a CD. Nobody's forcing you to pay, if you
have good bandwidth and want to download the iso yourself, that's great,
but not everybody's in the same boat. Linux CDs have been sold since the
early 1990s, because there is a demand, and I'm sure that will continue
to be the case.