Google analytics was originally Urchin, and If I remember correctly it was 49.95 a month. I heard about it from a friend and started paying for it. A few months later Google bought them and it was suddenly free. It felt like picking a good stock and the feeling of going from paid to free was elating. I say this not as a well actually (ironically it is), but to support that if you have a good product people will pay and will recommend it to friends. Free is only good if the number of users on your platform is of benefit to you. In your case, I think it's not and you are probably making the right choice by focusing on both product development, with a little revenue on the side from the start (or at least early). Good luck.