Dude are you kidding me? Unless that's a mint condition Rubicon (which its not in good condition at all from what you described) its not worth close to 19k.
A good condition Sahara blue books around 14k. So yeah, if its a Sahara with rust, beat shocks, worn tires and a lift (decreases resale value BTW regardless of what people want to believe), then $10k sounds about right.
So before you spout off that he doesn't know what he's talking about, how about more details? Sahara, Rubicon, trans, options, paint/body condition, etc?
I'm envisioning a pretty beat up Sahara. Was it regeared for the 35s?
Edit: based on Sals post (and the fact he was recently in the market.....lol) maybe the values and availability of wranglers varies a lot more by region than other cars. Around me they're a dime a dozen and a few sitting on every lot. I guess if they're hard to come by in some areas the dealers are able to drive up the price.