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theres 31M active users
if 1 in 100 players buys 1 FV cash item per update
the average FV cash item goes for around 25 FV cash
and theres 2 updates a week
310 FV cash is sold for $50
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31M / 100 = 310,000 items bought

310,000 * 25 = 7,750,000

7,750,000 * 2 = 15,500,000 FV cash spent per week

310 / 50 = 6.2 FV cash per dollar.

15,500,000 / 6.2 = $2,500,000 gross per week

$2,500,000 * 52 weeks in a year = $130,000,000 annual sales on Farmville alone.
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Again, this is probably incorrect. But you can see how it adds up fast with some quick educated guesses. Of course, this doesn’t take into account the FV cash you earn while leveling. If the number of people buying FV cash items goes to 1:50, their income doubles. But i wanted to play it conservatively.