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According to the website, the fee is (number of users * 0.001). Since the current fee is $2.91, the number of people who've signed up is around 2,910. Seems like at least a few people willing to throw in a few bucks to give it a shot. It'll be interesting to see what will happen to growth as the rate goes up and up.



It seems that the fee should not be linear to the number of users.

Make it log(x) or something.


The incentive for scalping will increase.


How much they've made so far, with scala:

  scala> def income(n_users:Int) = (1 to n_users) map(i => (i-1)*.001) reduceLeft(_+_)
 income: (Int)Double

  scala> income(2901)
 res0: Double = 4206.45


You need to round the intermediate values down like they seem to be doing.




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