There are a few that I've dismantled and then sold the body & neck, but never the entire package. Honestly, by the time I'm ready to get rid of it, the parts are worth more to me than making a marginal profit for the whole package.
A number of folks have said that they can sell one on-line for +/- $400. That'd be about $100-$200 profit. Selling just the body & neck is in the $75-$100 range, and I don't have to re-buy the hardware. That leaves me all of the hardware in-hand AND enough $$$ to replace the wood & get something else. That's enough to fund my builds, and that's good enough for me.
All that being said, I DO have on sitting in a local shop on consignment. I've also had a dude who's interested in the Retrotron prototype. Both of these are only in the $350 range, but I have VERY little money in them. Any of the others I'd probably be OK selling locally too, but it'd be for a LOT more than $400.