Let's not forget the downward price pressure exerted by the all new fourth generation BMW X5 (F95) that has just hit the market. I believe 2nd and 3rd generation are also now selling for less due to this. You can imagine the 2nd generation giving the first generation stiffer competition. The choices for buyers are much wider now.

__________________
'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.