Maybe it would be interesting to see how many manufacturers are represented in everyone's collections.
For instance, I have 7 manufacturers among my 14 games, a good variety I'd say. Bally, Chicago Coin, Fascination, Gottlieb, Spooky, Stern, and Williams.
I also thought for a while about how one might calculate a "manufacturer variety score." What I came up with is m^2/g, where m is the number of manufacturers and g is the number of games. So my score would be 7^2/14=3.5.
(For B/W era games, let's just use whichever a particular game is branded with.)
This may look like a disadvantage for those with huuuuge collections, but there's no way to not have a lot of the same manufacturers when the number of games vastly outnumbers the number of manufacturers, so that necessarily affects the "manufacturer variety score." It's just for fun and pointless, so don't take it too hard!
Someone with a lot of really early games should be able to run away with this... as long as they don't have 200 B/Ws and Sterns as well!