I wish this game had more power systems similar to Purification Pills as they are truly for the harcore p2p players (i.e. Samuel from CN or NA's Kozo)
The rest of us can just ignore this system.
Unless you're already maxed on L10 refines and got perfect purification stats, and even after that l9 charms/ /l9 magas/l12 cave keys/ l12 sum runes/l12 tactics etc... there is really no need to purposely go for these pills. Once 3.0 hits we'll be getting a new summon powering interface which will cost a lot. And there will be many many more power systems to come in the future.
If you're thinking of recharging this week to gain power off that pill you might want to think twice.
*even spending coupons on the ninja bond system will net you more power than these pills