They are, but even when you do it seems like the XJ market is much more reasonable than the the TJ market. When I decided last year to get into the 4-wheeling scene I was initially looking at XJs because I've had a few in the past, but the wife insisted on a TJ because she likes the whole no top no doors thing. So, I paid 9.5k for a TJ whereas the comparable XJ market at the time was a few grand less.
Yes, the XJ will always be cheaper than the Wrangler being as though the Wrangler is really the iconic Jeep.