We bought a used Schwinn Twin last year in Ohio for our wedding getaway vehicle. Ones in "good, used condition" generally sell on eBay for $200-$250 with local pickup. We paid about $200 for the red and white one in the photo. It had some minor rust on the chrome, a couple missing spokes, and we bought new tires. Probably spent about 10 hours in improvements.
We enjoy riding it in community events (Art Bikes at the Cherry Festival), lending it to friends (especially with kids), and feel we've gotten our money's worth out of it.