I am afraid prices for all High End companies are rising exponentially and I am sure it is at least in part, due to a small turnover. Like it or not, our hobby is dying on it's feet, with fewer and fewer people interested in setting up a decent system, compared with the golden age of the 60's and 70's say.
I know this isn't news to anybody, but we all have some idea of economics and business. The fewer sales there are, the more manufacturing costs and overheads are carried on each item sold. This is not going to change either, I can not see the High End dying out, but it will limp on with a rump of customers. Companies must adapt or die and they are. I think the middle ground is most at risk., there is some sort of budget industry selling reasonable amounts and the top end can manage with a few sales at insane prices. This may be why ARC is abandoning it's lower price ranges. As a company they are very good at churning over the product line, to persuade us to upgrade what we have or buy the latest and "best".
There have always been some real gems in their products and for me they have mainly been in the Power Amp area. The ARC Ref 75SE is one of these I believe