Yeah, I thought that was awfully low, too. Given that they were charging .03 Bitcoin for access, and, given Bitcoin's current value of about US$8K, that equates to about US$240. So, dividing US$370K by US$240 gives about 1540 paying users. On the one hand, that seems like a lot. On the other hand, he had users from all over the world. On the third hand, I'm not sure if that .03Bt was for eternal access or was a yearly (monthly) subscription fee, in which case the number of paid users would be a lot less.
Dave