Two quote from that Forbes article: "Most of the people here helped to pay for the game’s development—on average, $200 each, although some backers have given thousands." and "$242 million has been contributed by about 1.1 million fans"
I really don't know how they got these numbers. Here are the real number from the RSI-page:
Probably "on average $ 97 each" wasn't clickbaity enough.