I have a Green Dot Mastercard. It costs $4.95 to add any money to it and they charge another $4.95 per month service charge if there is money left on it at the end of the billing cycle. I used it once to purchase WB, then ODNT and never again. I kept it in case I need to make a major online purchase, but it would have to be a necessity with no other way to acquire it.
In other words, buying a Master skin would cost me $4.95 + $4.95 plus another $4.95 at the end of the month. OUCH!!!
Mine's not nearly as bad as that. It cost $2.50 to "load" each month and a monthly fee of $6.95. plus, $0.50 per retail purchase (Like a cred card). I got the card through a rent to own store called Easy Home and the card is called Epic from MasterCard.
BTW, the amount of the Authorization fee just switched to the positive this morning. Time for one of the newer Master skins. 
After using the trial less than a day,I had to have WindowBlinds so cost meant nothing.(worse than crack,lol)
Yes, much worse than crack. 