I think Apple's big mistake was the 15Gb. If they stuck with the 10Gb, I don't think the $50 gap to the iPod mini would have looked so bad. Maybe they should have dropped the the 10Gb/15Gb altogether..
Looking at the pricing:
4.5Gb - $249
15Gb - $299 ($50 more for an extra 10.5 Gb - whereas if it was still 10Gb, it would have been $50 for an extra 5.5Gb)
20Gb - $399 ($100 more for an extra 5Gb plus remote, dock and case)
40Gb - $499 ($100 more for an extra 20Gb)
I reckon they should have dropped the 10 and the 20 should have been cut to 15, retained the remote, dock and case, and been $349.
Looking at the pricing:
4.5Gb - $249
15Gb - $299 ($50 more for an extra 10.5 Gb - whereas if it was still 10Gb, it would have been $50 for an extra 5.5Gb)
20Gb - $399 ($100 more for an extra 5Gb plus remote, dock and case)
40Gb - $499 ($100 more for an extra 20Gb)
I reckon they should have dropped the 10 and the 20 should have been cut to 15, retained the remote, dock and case, and been $349.