Now you don't have a choice. To play Diamond and Champions you will need all max cards. It's very good that rentals are cheap and going cheaper still. You can rent to your hearts content.
Mind you rewards are exponentially higher in Diamond and Champions. 5 wins can get you 1000 DEC easily which was your cost of rent. You can safely rent 3000 or even 5000 Dec worth.
I think I will wait a few weeks before buying too much more - though I have spent heaps recently on older cards. Will rent what I can for now - especially since I can offset it with rent earnings - but as you know, I don't like being a renter.
well even I rent :)
Like it or not. Because I simply can't afford some of the beta cards.