Now you can the directly bid on the item you want! Lol. I was going to sell the codes because I have so many of them and I don't play on pogo anymore. =p.
I believe you can add it to your account even if you already have a year paid for. I know someone who has 5 years paid for on their account. I personally wouldn't replenish my account until the year is up but that's only because I forget my sign in info.