I don't think I would have owned the number of machines in my collector history if increasing machines prices was good for pinball.
If games always matched inflation with no devaluation of a title based on age alone not considering actual physical condition, there would be no secondary market, nor increasing number of collectors.
The pinball hobby continues to be built on the backs of used game sales in the full scope (whether HUO, reconditioned, fully restored, HEP, or projects), not new games for the time being. In the future this may change (if reproduction parts become unavailable again), but this has not occurred at this time, and at the current pricing will not change immediately.