There is a much easier way to transfer the balances. You don't have to add each card, then transfer the balance to your primary card.
- Add a card and assign it to be your primary card
- Under "Manage Cards", click on "transfer balance"
- It will list the cards you have added to the site, below that it will say "Or" and underneath that will have a button "Enter card information"
- After clicking on "enter card information" the page will change and you can just enter the card info and transfer to your primary card.
No need to add cards then delete them in order to transfer the balances from a physical or e-card to your primary.