I agree with CrazyLevi here (did I just say that), pinball is a business. The only way prices go down is by supply and demand or competition. Raise the price too much ($2,000 topper), many won't buy, but it makes more sense to make a few of them rather than thousands more at a lower price point. The Stones concert is a great analogy, because their market is getting as old as them but more affluent, so sell to the few at a higher price.
The difference is they don't need to worry about being an ongoing concern, when they are gone no more concerts. Not the same with Pinball. Failure to generate interest in the younger generation will lead to market stagnation, and eventually death. The car manufacturers know this, which is they offer entry level cars that no where near make the profits SUV or trucks do, hooking you young to develop some brand loyalty. Stern Pros could do this I think, but the price differential is not quite there. Home pins didn't work either, but I understand the trying.
Personally, other companies in this situation try hard to lower costs to bring their product more in line with market expectations. Off-shore, in-house production of critical components, economies of scale, etc. Maybe Stern is trying those with its move to bigger quarters.
What will work to bring prices down is competition and dark horse companies with leaner operating costs, putting out less expensive pins with hi value and developing brand loyalty with their entry level pins (I am thinking Spooky here, but American and others as well). The free market runs on competition and innovation. We all know we don't want too much innovation, at least in how a pin plays, but what is under the hood is fair game.