How many Walkman's or Discman's did you buy before the iPod came out? The market for portable music devices went up exponentially from the 90's to the mid-2000's when the iPod achieved mainstream status. I bought two iPods in three years before the iPhone made 'em useless.

Consumer behavior isn't set in stone.

Source: http://www.in-stat.com/press.asp?ID=1366&sku=IN0502148ID

Off topic, but the iPhone has done anything but make my iPod Classic useless. It's shown me what a brilliant and useful device my Classic is, that I can hold 120gigs of music in my pocket at all times. You have to be a music fan to really appreciate this, but for me I like that I have a smart phone and an iPod and, if my classic broke, I would certainly buy another one.

Re-read my comment. It's set-top box not TV.

Oops, my bad. The rest of us were discussion televisions, not set-top boxes!