Hang on the wall? OEM and the value is what it is.
Ride? Upgrade and it's worth more, in general.
The exception is the rare bike that no one thinks should be changed.
Many, for whom riding the OEM is preferable, are just too, uh, "thrifty" to upgrade.
Me, I'm with Bill. $400 less than MSRP, and much better than OEM.