Yeah, you're right, Andy. I was thinking they could simply be re-rimmed and respoked on the same hubs, but there's labor to consider as well if one doesn't do their own. And, there's tires as well.
And, too, there is that issue of breaking up a complete bike. I find myself facing that sometimes when I eBay one of mine. Unfortunately, I can often realize more from the individual sales than I can the complete bike -- and find more ready buyers as well. Do I feel good about it? No, I don't. It always seems better to sell it on whole, as something essential in the personality of the machine is lost when it is parted out.
Best,
Dan.