Well I’m in Alaska so values fluctuate more. This summer my local dealer sold a 2012 LC (with a rhino rack,RTT, RWs, home made drawers) with 85k miles on it for $82k. They offered me $70k (with my rack, skinny warrior, fridge) on the spot for my 2013 LX back in August when I was there to pick up a new cowl from the parts department. I was there again 2 weeks ago for an oil filter the sales manager I know well now said they could give me $45k. Just going off what I was offered personally.Personally, I would not describe the Land Cruiser inventory as a "ton", in fact I would say its very low when compared to other SUVs, particularly for the US market in the luxury offroad segment.
Comparing those metrics to availability of 2015 or newer G-wagens, GX460s, etc... or pretty much any SUV. Chances are, there are significantly more of them for sale then a few hundred for 7-8 MY.
Also, I find it hard to believe that your '13 LX was worth $70k this summer and a few months later it's worth $45k. Either your LX wasn't worth $70k then or its not worth $45k now. What is the mileage on it?