XO-1s don't come up for sale too often. When they do, I've seen them go for $800-1000. Not sure I've seen $1500 before. But I haven't watched XO-1 prices for the last few years.
Oh, here's one that went BIN on eBay for $1,150, doesn't have many of the original parts, and has more than a few miles.
http://www.ebay.com/itm/ws/eBayISAPI...vip=true&rt=nc
I think $1500 is high but not impossible for this bike. Admittedly it is 59 cm and on CL with only one picture, but buyers will seek it out and I guess tall people have money too. Hopefully he has lots more detailed pics to send interested parties.
IIRC, there were 1,000 made each year. So, 20 years on, how many are left in mint condition?
I wonder what mine is worth. It is the less desirable year, with sidepull brakes, and maybe the less desirable color, tusk rather than orange. But it is minty.