I tried. I spent several months looking for a pickup. The problem is that I am too damn picky. Criteria for a suitable purchase:
Make: Chevrolet (I don't care for the Sierra front end, plus I knew this wouldn't be easily swappable)
Model: Silverado 1500
Trim: LTZ Z71(had to settle for LT on this one)
Odometer: <52,000
Drive Train: 4WD (will not own 2WD)
Color: Summit White (would not settle on anything else)
Cab: Double (would not settle on anything else)
Price: <$31,000
Not from Texas (hurrican truck)
There were plenty of crew cabs out there, but I didn't want that short of a box, and I don't want a long bed. I found one Sierra that fit the build pretty well, but I stuck with the Silverado because I already knew the front would be swappable for 2014-2015 parts and I could get rid of projectors. That wouldn't work on the Sierra. I found a few others that were close, but the dealers didn't want to sell them at a reasonable price. I'm not going to pay $3,000 over market value for something just because the dealer is stubborn. I ended up with a 2016 that matches most of my criteria. It is an LT, but it only had 42,000 on the odometer and I paid like $27k. If I could have snagged a low mile 14-15 for the right price I totally would have.
Although I think it would be pretty neat, I think most of you are right. It would only hurt the resale value, and be a pain in the butt. The hood and grille wouldn't be hard to swap, but I'm sure the headlights have different harnesses, and it would be pretty silly to go chopping wires on a mostly new truck that currently has no issues.