Only 4 but I would still consider it a mini success that in 2-3 hours it got 8K+ visits, 45% trying demo and 8% clicking buy button. What I don't understand is when they are clicking buy button why aren't they actually completing the transaction? Is gumroad turning them off or the HN crowd is just testing if buy button actually works. :)
I am unable to use stripe as I'm not from US and I don't have a bank account there. Gumroad itself uses stripe and pays the 2.9% + 30 cents a transaction. It keeps the rest - 2.1%