They both kinda out of the meta, with Tsunade occasionally being used in arena, Karin even less so. The latter can be very useful for ninja exams, the former too to a certain extent. Is that warrant the price tag? That's subjective and up to u to decide. If you recharging and can easily afford them there's no reason to not pick them up. If you have to ration your coupons more, then there's a case to be made for the power packs - assuming you're not interested in Orochimaru either.