$21k?!?!? Did he just see re-runs of That 70s Show and think it created a huge demand for Vista Cruisers?
Now on eBay. http://www.ebay.com/itm/1968-Oldsmobile-Other-/172022387830?_trksid=p2141725.m3641.l6368
As of the moment, the high bid of about $7000 is one-third of his buy-it-now price. The market is telling him something. It's not a $20,000+ car. Half that is doing well. If the bidding gets to five figures, he should take it and run.