As of the present moment, I am into my HMMWV for about twice the auction "win" price. It is full mission capable, and I would drive her anywhere. She's an older 6.2L, and perhaps not as fast or capable as later models, but "not much" is still a heckuva lot more than I need or plan to attempt (here, hold my beer).
Should I sell it (on CL if I do) this coming Spring, I expect $15K would be the bottom of my possible prices (I am planning a few other mods and improvements) and I wouldn't make much if anything after bid price, auction fees, taxes, delivery and upgrades/repairs, and certainly not "bank".
Guys on CL who just hose it off, throw some paint at the corrosion, put some Spartan-related stickers on it and change fluids probably DO make 3-4 grand, but they are easy to spot (for me) and I won't buy a vehicle that hasn't had the hubs serviced and other HMMWV-only things that Joe 6-pack wouldn't know to do. If they use words like "rare" or "special" in the ad I close it immediately, these are opportunists.
Bulldogger