Quoted from Pinballer67:
Good points. How about different categories, so we compare apples to apples?
I'm no expert, but I'm thinking:
1. EM (is wood rail worth mentioning? I have no idea)
2. Early SS (1977-1985)
3. Late SS (sys 11 etc) 1986-1990
4. DMD (1991-1999)
5. Early Modern (2000-2012) - up until WoZ
6. Contemporary Modern (2013-present)
I made up a quick spreadsheet.
Removed games with less than 500 machines
Removed novelty machines
Removed machines with less than 15 ratings
Categorized Sega with Data East.
Only made the list with Bally, Capcom, Data East, Gottlieb, Stern, and Williams
I made it for fun.