street locations and 1.5 million arcade machines active in North America. The market was very competitive; the average life span of an arcade game was four to six months. Some games like Robby Roto failed because they were too complex to learn quickly, and others like Star Fire because they were too unfamiliar to the audience. Qix was briefly very popular but, Taito's Keith Egging later said, "too mystifying for gamers ... impossible to master and when the novelty wore off, the game faded". At around this time, the home video game industry (second-generation video game consoles and early home computer games) emerged as "an outgrowth of the widespread success of video arcades" at the time. In 1980, the U.S. arcade video game industry's revenue generated from quarters tripled to $2.8 billion. By 1981, the arcade video game industry in the United States was generating an annual revenue of over $5 billion with some estimates as high as $10.5 billion for all video games (arcade and home) in the U.S. that year, which was three times the amount spent on movie tickets in 1981. The total revenue for the U.S. arcade video game industry in 1981 was estimated at more than $7 billion though some analysts estimated the real amount may have been much higher. By 1982, video games accounted for 87% of the $8.9 billion in commercial games sales in the United States. In 1982, the arcade video game industry's revenue in quarters was estimated at $8 billion surpassing the annual gross revenue of both pop music ($4 billion) and Hollywood films ($3 billion) combined that year. It also exceeded the revenues of all major sports combined at the time, earning three times the combined ticket and television revenues of Major League Baseball, basketball, and American football, as well as earning twice as much as all the casinos in Nevada combined. This was also more than twice as much revenue as the $3.8 billion generated by the home video game industry (during the second generation of consoles) that same year; both the arcade and home markets combined added up to a total revenue between $11.8 billion and $12.8 billion for the U.S. video game industry in 1982. In comparison, the U.S. video game industry in 2011 generated total revenues between $16.3 billion and $16.6 billion. Prior to the golden age, pinball machines were more popular than video games. The