Skill games have always been a big part of every society. Games like cards and backgammon are enjoyed by millions of people. If online casinos started offering action on skill games it would attract more players to the sites. These games can be raked for profit, or a predetermined buy-in fee could be charged before every game.
Backgammon is already competitive, and thousands of dollars can be won in tournaments. This game would surely be popular online. Video games of all kinds could be offered. The networks for the players already exist. They just need to provide prizes to the winners. Gamers will be lining up to compete. Even chess action could be offered.
Trump card games and cribbage could all be played online. Many people are more familiar with these traditional games then most versions of poker, and all these skill games are perfect for tournaments and cash games.