Having just ridden the 2014 Tenere Tragic's run on a 1983 Tenere, I can assure you that there is a reasonably strong demand for the old girls.
As Rookie#1 has said having the correct tenere specific bits in reasonable condition is a big determining factor in the value of this model as things like the headlight shroud, oil cooler cover, LH Side panel, rear carrier and toolbox are NLA through Yamaha and command hugh prices if you can find then as NOS.
Surprisingly, another thing that is a big determining factor in what you can get for a 1983 Tenere is the Engine/Frame number. Amungst the True Tragic's there is a ongoing "Pissing Contest" to see who has the bike with the earliest serial number. The current lowest number is 39E-000117, which makes it the 16th built for the Australian market if this model followed the traditional Yamaha numbering scheme where the frame and engine numbers start at 000101.
The wreck below which was a "Stop and have a look" during the resent Tragic's run was closely examined by a few of us to check the frame number (barely readable, but agreed to be 39E-000176) to see if it was worth contacting the owner and making an offer.
CJ