Good idea.
If you can lower your payment threshold from 0.1 btc to say, 0.01 btc then I think more authors will consider to try listing their ebooks there.
Now it seems the number of listings is still far from enough.
Thanks for the feedback! Just to be clear, _all_ royalties are paid out at the end of the month, irrespective of amount. Only if the author reaches .1 before the end of the month then I send it out in advance of the monthly payout.