Every couple of months, I recharge my Themeforest account (html templates), as well as my Moniker's (domain names). I pay and they credit my account, which make

Every couple of months, I recharge my Themeforest account (html templates), as well as my Moniker's (domain names). I pay and they credit my account, which makes it easier to buy goods, without the hassle of a payment process. The thing is, while I put in $50, I probably only use $10 at a time and my account can stay credited for months. I'd be ready to bet that by the time my credits have all been spent, the money I originally paid for them has accumulated some interest for these vendors. This revenue model is rather common. If Ubuntu sold vouchers that allowed me to buy software at a slight discount, rather than connecting to Paypal each time, I'd pay for it. The best part is that it has the numbers and the products to make it work for them as well.