Eddie, I would think that someone would really appreciate finding something like this. Alot of people are looking for any type of cantilevers that they can rat out. Some just don't have the time, place or ambition to do any type of painting. They can usually piece together a bike but not paint it up. I don't know how much more money you can get by primering them, but somebody's gotta be interested. Just gotta find him/her! Most of the people I've run into either wanna do everything themselves or consider "grunt work" as putting air in the tires!
What if you sold the frames "as is" and offered the option of primering them or even painting them for a higher price.
Here's another perspective,
We go every year to the Ann Arbor bike show/swapmeet and for most people, it doesn't matter what it looks like if it's what they're looking for. The price of the old stuff varies alot by how well the original paint is, but a freshly painted or primered bike usually get the, "why did you paint it, it got any cracks, bondo, or has it been welded. Seems most people view any repainting as a sort of a "cover up", even if it's a fully built up bike.
Don't know if this helps , but good luck,
Chainy