How badly does price drop for RIP manufacturer?

I have noticed posts of companies that have gone under. It is obvious that prices fall for gear from manufacturers that have gone under, but what happens to prices of gear whose restoration is practically impossible due to very specific components. Components that were made to order?
Examples of these might be things like:
The Sumo Polaris amps, that have a specific type of mosfet for the output stages.
Another example might be older gear, older Japanese RIP manufacturers like Sansui from the 70s.
Furthermore, the Spica speakers that had closed match tolerance drivers and perhaps crossover components.

Would you contemplate spending money, eventhough a minimal % of the original MSRP for gear that might die in the next sonic meltdown?