There must be a deeper basis behind this. Some kind of psychology behind pricing. I've noticed it everywhere I turn.
One particulary interesting case was the packaging on Tesco (large supermarket chain the UK) branded toilet paper. It said it was just as strong and soft as Andrex, the leading brand. Andrex is much more expensive but still remains the leading brand!
I've actually been toying with this thought for a while and now it warrants much further investigation.