I mined the three networks for outgoing payments from three addresses which I think belong to Storj and quickly threw this together to get an idea of the payout distribution:
Note that “unique” here is the same definition as in the OP. The median address receives 26.6 STORJ which is about $17.5 USD at time of writing.
And here’s a non-logarithmic plot with 200 STORJ upper limit:
