Don't let the name fool you: so-called "penny slots" are actually the most profitable games for the casino industry. https://www.washingtonpost.com/newssearch/?query=mtline9.com/%ed%86%a0%ed%86%a0%ec%82%ac%ec%9d%b4%ed%8a%b8 In a 2004 report by the US Department of Justice, researchers interviewed people who had been arrested in Las Vegas and Des Moines and found that the percentage of problem...