The "rake" as they call it, i am told that at party it operates on a sliding scale, a percentage of the total pot or of the winning hand. This system tends to take a higher percentage from the lower limit tables (5%) and less from the larger (1 or 2%) to keep the "rake" at anywhere between 50 cents to $5 per hand. In some circumstances the max rake will be capped depending on the number of players and pot limits.

You should give it a try, play with fake or play money as they call it - but a warning it can be addictive!