An anonymous reader writes: Sinsoft introduces a business model where users get to download the game for free and playing the game costs 50c per play. While this idea is not new, Sinsoft claims that its mixture of web interface to purchase credit combined with client-server arcade cabinet for the game does provide a smoother experience. The company doesn't have a complete game yet, but it is showing off its game engine (Radial Engine) and the insert coin system at its site sinsoft.com. What do you guys think? Is the insert coin system a viable business model for indie game developers?