The author has not charged money for his app yet so while we know some users like the application, it doesn't tell if they are willing to pay for it. I agree t

The author has not charged money for his app yet so while we know some users like the application, it doesn't tell if they are willing to pay for it. I agree that it depends on the customer whether you should charge right off the bat or not, but the article does indicate its a paid site now: "Then after two months of free – I turned the site paid." "Subsequently Pluggio retention rates of paid users are thorugh the roof – with the average paid user sticking around for six to nine months."