Secondary market value is going to vary. All you can only throw your offer out there - if the seller doesn't accept, they don't accept. Also, don't take the seller's word for it on the warranty transfer - check with Trek. Maybe things have changed recently, but in the US, at least, the Trek warranty only applied to the original buyer.
Edit: warranty for the US (my bolding)-
Lifetime
Framesets (frame and rigid fork), main frame, and full suspension swing arms for the lifetime of the original owner
Bontrager wheels with carbon rims
Originally Posted by
maartendc
The seller is asking 2000 EUR, which I believe is too high. For that little savings, why would someone take the risk buying used?
These days, availability could be a the overriding factor.