I inherited them about ten years ago, and for a long time they sat around in boxes, gathering dust. Then we got into our new house, with a dining room, and started having people over for dinner. And using my mom's good china. It has been used more times in the past three months than it did in twenty years prior to that. Why? Well, because it's there. So why not?
Last year, I bought a lot of RC10s and parts, and among them was a Worlds car. Good shape, but not pristine. I think it had been someone's club racer. It's dirty and scuffed, but not abused, and still has the original yellow front wheels with the aluminum screws, and the Turbo Mirage body. I stuck it in a box when I got it, figuring I'd "save" it, and run the others.
The other day, I started thinking... save it for what? It's a rare-ish car, but not precious, and it's the highest-spec RC10 I have. Why shouldn't it be my own personal runner? It's not like plan to bash it or abuse it. It's not doing anybody any good sitting in a box.
So here it is, my "good china" RC10 Worlds car, ready for the old teardown/cleanup/rebuild:

It will get a mild-ish modified motor, and some nice modern electronics. I plan to clean up the original body and re-decal it to make it "mine", and reuse as many of the old parts as I can, and not irrevocably alter any Worlds-specific parts.