I too bought a bunch of untamed and dice packs on the secondary market (Wax). And like you I have not felt the need to rent - yet. That time though may be coming soon as I'm going to be needing a higher level summoner so I can play my upgraded cards.
It is nice the option to rent cards like that is available as buying them becomes an expensive proposition.
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Buying cards is definitely not cheap. I HAVE discovered that it's not quite so bad when you pay in DEC for some reason. But we're back to the same problem I have with potions. You lose airdrop points using DEC. That said, at least you're gaining card value so it somewhat makes up for it.
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