out of 1
The score represents the average amount you will win for each $1 you spend.
Any score over 1.00 means on average you will make money from this game.
Examples:
A score of 0.7 means on average for every $1 you spend, you will win $0.70 (ie: lose $0.30)
A score of 1.1 means on average for every $1 you spend, you will win $1.10 (ie: make $0.10)
All numbers are just averages!