At Sportland and Fun City, for instance, out of 363 machines, only 24 offer prizes worth more than $30 on one play, Greenspan said. Those 24 are among the most popular games in the two arcades, though, accounting for 10 percent to 15 percent of revenue, he said. They would make far less if they were not offering such attractive prizes as Beats headphones and GoPro cameras that cost about $300 retail, he said.