This is basically the same problem as monetising an open source project on GitHub. I don't know what O'Reilly's take of a 5-20USD eBook was, but I bet you the authors get more than your average Patreon.
Even if you do convince someone to pay (did I read that 1% was a good conversion rate?), how difficult is it to get their money? How many are you going to lose to the PayPal login process? How much money is your payment processor going to take?
While I've got you here (although this looks like a throwaway account), how easy is it for you to make a credit card payment to a US merchant from Brazil? Can you use Patreon? PayPal? Flattr?
Even if you do convince someone to pay (did I read that 1% was a good conversion rate?), how difficult is it to get their money? How many are you going to lose to the PayPal login process? How much money is your payment processor going to take?
While I've got you here (although this looks like a throwaway account), how easy is it for you to make a credit card payment to a US merchant from Brazil? Can you use Patreon? PayPal? Flattr?
Also, Bitcoin is not the solution here.