Google Wallet

So, for the people that knows me, they know I crack emails and such for some profits. Well, I now have a bunch of Gmails with valid Google Wallets balances and working credit cards linked to the Google Wallet. How do I know it actually worked? I've purchased a small item with them to test it out and the payment went through. So my question today is, do these have any values? Since people can easily buy stuff with these Google Wallets. If they do have a value, what would be the estimated value?

Thanks to whomever replies with their opinion.

They defenitely are worth something especially if they have a card linked up but you could get in serious trouble for using their card that's just my opinion though.