Fair enough, though I could caution a question of swapping items on a parts for life purchase could only be reliably answered the contacting the manufacturer.
Parts for life programs come with plenty of fine print, and they also do not include labor. I would not want to be boxed into purchasing 3 big items from one manufacturer to save about 60 bucks on a service, but that's just me. I'm sure there are as many people that are content with the arrangement, though.
As Bob noted, these programs require servicing much more frequent than necessary. It also prevents you from picking and choosing gear that you want/need from different manufacturers.