Hey a lot of good theories.

1. The difference from 80 to 90% is a few extra small pays. Casinos do better when the games are lose.

2. Some games do better when new because they are "front loaded", more pays at the beggining of the cycle.

3. Newer games have about 10 percentages options. The cycle will always favor the house.

Lastly, play is more important then set percentage. Good