It basically boils down to this:
1. Buy the product at a decent price level with a limited warranty, and then "IF" it needs repairs, send it in and pay the costs required for repairs.
or
2. Buy the product at an inflated price, far above what it really should sell for considering the quality of the components used, and at the same time PAY for the lifetime warranty repairs up front, whether you ever use them or not.
In the later example, the manufacturer is getting his profits up front as well as his repair costs up front, whether you ever use them or not. Quite a deal for the manufacturer, probably NOT for the cousumer.
Like Brad says, there is no such thing as a free lunch (or free warranty).
Ralph