What price should I charge people for using my app? It’s a pretty basic question, and one fundamental to your business: charge too little, and people won’t use your service. Charge too much, and you’ll have the same problem.
One principle behind developing web apps is that you should aim to fail fast, meaning that if your idea isn’t working out, it’s better that you find out it’s not viable before you invest a lot of time and effort in it. The problem is: it’s not always easy to give up on your dreams.