The amount (expressed in percent or real units) a casino assumes certain play is worth to them. Hence, a positive Theoretical is an assumed loss to the the player. A casino typically comps players based on their actual Theoretical. For example, a casino may assign a certain game a Theoretical of 5%. Assuming a player's coin-in is $10,000, a casino would then limit total comps to some fraction (less then one) of the theo, $500. If the player had the same coin-in on a game with 1% Theoretical, the comps would have been limited to some fraction of $100.