Seriously consider making a recurring charge, asap, before it's too late. I made a reasonably successful game where the income was based entirely on new users

Seriously consider making a recurring charge, asap, before it's too late. I made a reasonably successful game where the income was based entirely on new users paying in. It was very difficult and discouraging to me to see my game taking off with unexpected success, while my income stream was totally flat. Server load and personal workload for me increasing each month, while my income was totally the same each month. When the income is based totally on growth, that's what success looks like. Active user count double what it was last month, income same this month as last month. And it doesn't feel entirely good. You need recurring revenue. If you figure out how to provide value, the customers will pay. Godspeed and good luck!