I'm not sure why, but when this first happened with me - it was selling a book I wrote online - it started to change my way of thinking, opening a realm of possibilities I never considered before.
Because if you can sell something to a customer for €10,72, that's €107,20 for 10 customers and €10,720 for 1,000 customers. And, unlike with employment, where there is a limit on salaries, there is no - theoretical - upper limit on your revenue.
Congratulations and hope you keep building your entrepreneurial muscle. Best of luck with the side project and beyond!