The casinos generally operate with new customers on a "time" basis. If you are spending enough time at the tables, they will immediately mark you and be receptive to your request for comps. Unless you are a celeb, very distinctive looking, or a high roller, it is best to alert the pit boss at your first stop that you intend to give this house your time, you would like to set up a "line" (of credit), and then you will be put into their system. After enough time (this varies by house), you will become a comped customer with no regard as to whether you win or lose, and don't think that they don't know about this. Their systems will tell them about your betting style, the length of your stay at any particular game or table, and how much you are winning or losing, almost to the dime. Drawing down your line and not using the chips at the tables will get you nothing. The main criterion as to the size of the comps will be the size of your play. Naturally the $100 player will be showered with greater comps than the $5 player, but even the latter will get due respect from most houses if they see him as a steady customer.