I wonder why, though. The publishers don't need to accept Bitcoin, HB just gives them dollars in the end. I would like to hear from an official source on this, because Bitcoin seems like the best payment method for them (and me, because I love how easy it is to use).
I completely fail to understand why they seem to rather dislike it.
It's possible that HB doesn't want to be liable for the conversion of BTC to USD, and therefore the two parties are unable to come to an agreement as to how the royalties and compensation works for BTC sales. In the absence of an agreement on how to process BTC, it's easiest to simply not accept BTC for all parties.
That sounds unlikely to me, since Coinbase and the other processors promise to accept a price in USD and give you exactly that price, abstracting payment from you completely...
I completely fail to understand why they seem to rather dislike it.