I see it says only for new accts but has anyone tried, and what about Age of Conan can that code be used on an existing acct?

There's more confusion with EVE. I've bought it for $5 during Steam Weekend Deal, played it occasionaly, found it fun and then my 30 days passed and I didn't look into prepaids or subscription as I was (and still am :)) busy with WAR.

Now if I understand correctly I can't renew my subscription with a cheap 1 month PLEX card (around $12 here) but have to buy other prepaid card with 2 months for around $40. Correct me if I'm wrong - I'd love to play a month of EVE soon.