It was brought to my attention as a potential exploit. For example people can run two accounts and rent their own cards to bypass the delegation cooldown and essentially get twice the rewards for one set of cards. It's up to the DAO whether or not it wants to address this issue as suggested in this proposal or not. If not the DAO rejects this proposal then we may just have to deal with it until a better idea is suggested. I think there are pros and cons to both side of this one.