Its high because they know what they have...a manual x5 with baseline a/c and stereo. Stick = omfg I want. Base a/c works perfect and super easy to service. base stereo = go nuts on a budget yourself. 150k really isnt that bad but right where u need to do the maintenance. I bought mine at 138k and started knocking it out piece by piece and keeping warranty receipts and records bu I do this for all my cars.

Ive already been keeping an eye out for a spare engine or two in the upull yards and such. Kinda nice with the interchange once you get into the blocks and heads