I agree with you on all counts pretty much, it is worth 150k but probably wont get it. I would not pay that price, but only because I can probably get what I want out of a cheaper Tele.
At 150k (about $2400 landed at my door) I would prefer to look for a used Fender CS Nocaster or a custom build.
Used Van Zandt and Momose Teles can be had easily for 100k if you're patient, and Navigators seem be more than 100k and less than 100k, there's no rhyme or reason to it.
For the person who is looking for one of these DT-250s, it's a reasonable deal, because it looks to be in pretty good condition, and how many were actually made anyway? I'd guess not that many.