Consistently getting people paying more than asking price

After moving my book from FastSpring to Gumroad, I decided to open the option to people of paying as much as they wanted, and I have been pleasantly suprised. The selling price point is 10U$, but I do get people consistently paying 20U$ or 25$, which is an amazing surprise, and a great feeling. I reached out to some of them to see why they payed more than what I was asking for.

The answers were surprisingly motivating: they found that the content I generate cannot be found anywhere else, and the depth and clarity of the tutorials I publish really helped them in their daily work. Some were not interested in the book itself, but they just wanted to give something back. They judged the effort I put behind the articles and decided to give something extra back.

I even got a professor who is planning to use the book as the source for one of his courses this semester.

It is a fantastic feeling when other aknowledge your work and effort.