Realistically, my guess is that in specific cases, it is due to supply chain issues. They can be cumulative - a delay (or a price increase) in a primary component affects everything that went after it in the chain.
Especially sensitive products would be those where there are specific proprietary components being delayed. That is, there is no substitute for them.
When the AKM DAC chip factory went poof, there were available other established DAC chip makers and DAC manufacturers adapted.
In the meantime though, apparently the prices of remaining AKM chips skyrocketed.