They are becoming more and more popular. With that said it is very hard to go off of KBB. Some enthusiasts are already saying the TBS is a collectors bike.
I got mine a couple of years ago for $4k, it had all the extras, however had higher mileage.
It is a very fun bike to ride, don't think I will be selling this one.
For what it is worth my local dealer
http://www.performancecycleokc.com/n...222&pov=772309 has a mint condition TBS for sale.
He is on the high end of price, but I can tell you it is amazing condition.