I will bet there's a healthy secondary market in aeron chairs wherever you are. Check craigslist.

Imagine if a Saturn station wagon had 55 parts, none of which were in motion with any regularity. How long would they last? And how much of an aftermarket would there be in keeping them functional, especially if Saturn freely sold replacement parts to anyone who wanted them?

The part that wears out is the pellicle. Used to be you could buy the fabric and redo it but now you just buy replacement seat pans.