Mark,
CVRTs are more valuable for 2 reasons. Firstly they are small, you can fit them in many places you can't fit a 432. Park a CVRT next to a 432 and the 432 looks huge. A CVRT is nice to drive on the road, you are no wider than most of the cars. A 432 is a nightmare, especially with that supid drivers hatch sticking up in the way.
Secondly they made 3000+ 432s. Now if you look at the CVRTs, they made about 300 Scorpions, of these 136 were converted to Sabres, of these 136 less than half went to civilian owners. They made 89 Strikers, there are maybe 20 in private hands. Withams had 200 432s in the last batch, they have been selling Mk2 432s off for a long time.
It's all supply a demand, remember they aren't making any more of any of these vehicles, so the prices can only go up as more people become interested in them.
Chris