No wait, I researched it. If you have membership for 1+ years without a break for 14 days or more, you get extra when you use a "voucher" (prepaid card).
If youre eligible for $5.00/month u pay 16.7¢/day If you have to do $5.95, 19.8¢/day The cards are $5.95 ea? You're eligible for 16.7¢ day but y shud u pay 19.8¢?? so u pay 17¢ a day with a card