Think about the situation where you have couple of debit cards and you use one all the time, but the other is just a backup in case first one stops working. Now suppose it did stop working, can you remember the PIN code for your backup card? That's a good use of Wallet Pro right there. Another example is luggage combination lock which you may need away from computer. Or just think about travel in general: you're in a foreign country and don't have your PC with you, but now you think you need to access some rarely used account, like pay the phone bill or something. There is advantage to keeping your data within your reach, so you don't have to plan ahead as much.