You are running a business, sooner or later your bottom line will be affected. What you should so is inform the Scholarship account holders that $19.99 will be

You are running a business, sooner or later your bottom line will be affected. What you should so is inform the Scholarship account holders that $19.99 will be deducted from their total earning of one year. This way it will be a win-win scenario. They get a free account upfront and they pay you later. You are still getting paid in the end!