Some collectors have provided sourcing of games for well over 30 years.
It allows us to pretty much find anything.
This includes rare titles, and support with evaluation, shipping, and pickup.

Continued pinflation will drive more new owners with limited funding options to learn to repair used machines and potentially increase the need for reproduction parts and the desire to find older titles as relevant to this thread.

This is a historical repeated cycle, but never a bad thing for the hobby. The same owners compete against dealers/brokers.
The more people restore, the more games are saved, rather than being parted out or destroyed, as they are recognized as having some value, but not necessarily "gold" especially when they cannot fix what they have. The short term however, games are cannabilized for the same reasons.

In the long term, pinball game manufacturers will continue to push potential owners further away from buying new machines until industry stagnation. This is not a new revelation. At this point, this really needs to happen to get people to recognize realities, and manufacturers step on themselves. This remains what some people call a market bubble, which it is not, but a stall. Game distributors do not survive long term unless they are diversified both in coin operated devices beyond pinball and include used games. They simply shutter their doors. This is why only several dozen long time dealers remain who started in the period of the early 1980s.

Learn from collectors those that are willing to teach, as they will not be around forever. Many dealers don't consider "older games" useful for profit, don't understand or know how to fix them, or say they "cannot find parts". I heard all these comments the first time in 1988, regarding titles made before 1977. Many older games can be saved with minimal-moderate physical work without performing full restorations.