Price stability XC90 vs. price decline V70?

Moin! I would like to hear your opinions about my observations regarding the prices of the V70 and XC90. I got a V70II summ in 2009, year 2005 and almost 90,000 km on the clock, for quite exactly 25,000 euros, which was at the time a kind of reference price for a fully equipped V70. A not even initially equivalent equipped XC90 I would have got with the same Bj./running performance for approx. 27k, a summum for well over 30k. A few weeks later set with Volvo the P and mine had exactly the same V70 standing on the farm, only 1 year younger and with over 50,000 km less mileage. This V70 went horribly away for under 21k and that gave at the time a “wasting premium” of 6.000 euros. So I would have had to spend less of the proceeds from my old 850 of 1,500 euros still 8,500 euros less for a car, which had almost half of the mileage. The prices for the V70 did not have to t recovered, the prices for the XC90 remained stable. Now I would still get just under 15k with 105,000 km of mileage for my V70 summum, but would still have to lay minimum 24k for a reasonably usable XC90. My search agent on mobile.de unfortunately says the same… can you confirm that? And if so, why is that so? Greetings elchleder