More than 60 percent of today's casino revenue is generated by slot players alone, and casinos have gotten smart about that. No longer are slot players relegated to the farthest reaches of the house. Now they are the most sought-after guests of just about every casino on the mainland. And to prove their adoration, casinos compete ruthlessly for your slot-playing business. According to Jeffrey Compton, whose Las Vegas Guide to Slot Clubs is a must if you're into the one-armed bandits, the overwhelming majority of casinos in Sin City and Atlantic City have slot clubs, and you will be doing yourself a favor by joining as many of them as you can. Shortly thereafter, you'll receive invitations to participate in slot tournaments, get reduced rooms rates, special birthday cards, party invitations, and more. .