Casual Gamer's are the bane of the current gaming industry. Casual Gamers prefer to play games on an inferior console rather than on a superior PC. Most Casual Gamers are fans of only Sports and racing games as anything with a fantasy or sci-fi setting is "nerdy" to them. To them gaming isn't a hobby but just something you do for fun so games should never be complicated because that would require thinking on their part and would not be fun for them.
Causual Gamers attitude towards games causes them to only buy simplistic sports and action titles. This harms the development and evolution of the industry as a whole because hartless publishers like EA, Ubi-soft and Sega will use their influence to crush new and innovative ideas and push foreward titles which will sell faster to the unwashed masses.
A Casual gamer actually said to me once "Well *I* don't like to think then *I* play games" as if not thinking some how made him better than me. Yeah that makes a WHOLE TON of sense, jackass. Not thinking is obviously making you a better person.