Haha well by that I mean over the last 5 or so years seems like the average for a 'basic and stock' deuce has gone up about 2-3k, that I've noticed. Considering that the value of our dollar keeps falling and inflation rising, it's a "reasonable rate" of increase. Not enough to go out and buy a dozen to park for a few years, then turn around and make a huge amount of money. Just enough to where if you were willing to sell you could make your money back (if you didn't go too custom). If the supply really has dried up, then the value will go up faster and the 'stock' parts will be harder to get. But these trucks are easy to update for those that want to. Simple design that has left plenty of room for different options (engine, drivetrain, suspension, etc).
Value depends on your market. Take the housing and land here where I live in Midland Texas, oil country. 7 years ago the apartment I had out here was $335 a month for a 650sq ft, nothing fancy. That same apartment now is $1120 a month (no upgrades) because of the housing shortage. The land is barren, it's a desert. Good luck finding an acre for less than $20,000 that's unimproved. I bought my house 2 years ago for 173k, this year it was valued at 230k and I haven't done anything to improve it, just maintain.