The MCM rumor was likely true... The hints were pretty explicit, however from memory it was hinted as a daily for for one of then, so my guess is that he had it for a week or two and got a bit of a shock as to how hard they are to run as a daily and has already sold it
As for prices, im feeling its because the 90's jdm cars are becoming available in America (especially gtr's) which are driving up prices on the halo cars, which then has a flow on effect on traditionally cheaper options as people go looking for other options