Neat topic.
I agree with MuscleRodz, in that there are different types of buyers.
If I was not in the business, but had similar knowledge that I do currently about pro-touring cars, I would care about the suspension, brakes, engine, and how good the bodywork was. I feel this would be the same for any pro-touring educated individual.
Now, talking about the average guy who doesn't know about the pro-touring world, "oh man.. this thing has 4 wheel discs?? AND a 383??? SOLD"
As the pro-touring trend grows, (and economy gets better) I do believe that the 100k cars will sell better, but it seems like right now it's still not to the full potential.
It's just like building a house.. basically the same principles apply. I would pay a little more for a house that had been outfitted with 220v for welders and lifts, compared to a Joe Schmoe who plugs his 1hp air compressor in to fill up his lawn mower tires.. because he doesn't have a use or desire for 220.
In my personal opinion, I don't think resale value should matter all that much if you're building a car, as long as its your car and you love it because it was built to your specification. If they're quick flips where little to no bodywork is required, that's ok.. but 95% of the cars we've had through here have had a rough history in one way or another.. which ends up costing the end user more money since they're doing a full build & don't want to skimp on something that matters in the long run.
-Dale