Thank You very much for a prompt and detailed answer.
I see You are very dedicated to Your project, and I hope you will have a great success.
Maybe, just a small recommendation from my side. If You are charge 100USD for Your card, it will be much more buyers if You if You present Your supporting banks, and reveal Your legal and company data. It is hard to have confidence in this project if Your domain is registered anonymously via WhoisGuard Inc. (Panama).