Chart, page-4864

The $11 mil in B2B sales in April would have likely included a lot of ZNO's current resellers stocking up due to the huge spike in demand. Some most likely bought enough to keep them going for several months so their need to restock will also be spaced out over several months, which I think would explain the slower months after that.
That being said it looks like they are continuing to sign up new resellers daily who themselves will have to get the word out there and generate a market for themselves before they start buying in bulk.
I'm not writing off ZNO yet.