I initially charged 9$ for my desktop shareware product. This was 7 years back. I thought the app was worth only 9$ that time. But when I understood many people

I initially charged 9$ for my desktop shareware product. This was 7 years back. I thought the app was worth only 9$ that time. But when I understood many people purchased it, I increased to 19$, then 40$ now, but with many more features over the time. I make an average of 800$/month. Stopped using Stripe because of their heavy chargeback fees and bad dispute mechanism. Uses only PayPal to accept payment.