Interesting question.
I don't like to talk numbers of games anymore for various public reasons, but rather percentages at this point in my collecting days.
Some will understand more fully, when they read the old collector meme joke below.
Rough estimates:
55% titles are installed in my home (fully operational), and probably more than a person should
30% titles are locked up in my warehouse (functional and serviced, but in "pinball stasis")
15% titles are project games in my warehouse (non-operational)
5% titles are located elsewhere awaiting pickup or stored with other collectors (operational and non-operational)
Storage is climate controlled.
I try not to have too many projects at any given time, around 10-15% of my ownership as a limit.
I figured this out this percentage about 15-20 years ago for the reasons listed below.
I can state is once you push past a certain threshold of total number of games, it is not possible to maintain everything "100% functional" unless it is your full time job, and this is questionable even if you are an operator with a moderate size tech team.
Work becomes exponential once you go past 50+ games and games are used frequently.
There is ALWAYS work to be done and things to correct, even if small and it does not matter if the games are EM or SS.
Any large volume collector (especially once someone pushes past 100+ complete games, NOT parts) that states all their pinball games are in "perfect operating condition" are completely lying or they only buy NIB machines sitting in a corner which never are played.
Pinball Enough.jpg