The money is in old mountain bikes and versatile camping/ off road touring builds now. Bridgestones of any flavor, early lugged Stumpjumpers, lugged Trek 9xx series are bringing big money in the bigger, cooler cities.

No one wants another mid range generic Japanese road bike or even a nicer 531 Trek these days. Late 80s/early 90s are a little more desirable for retro roadie conversions.

However, I am surprised to see the same value drop in traditional touring bikes. They're doing a little better than roadies, and the RB-T and Specialized Sequoia/Expedition are going up, but smaller names have gone down. Probably the limited tire clearance and 27" wheels. Even with a 700c conversion, most will only fit a 32 or mayybe a 35 with fenders, which isn't very big these days.