Sometimes I allow recharging, limited by two factors: Time and money.
It takes 24 hours to imbue a new charge into an item, and a number of rare, pricy ingredients, typically 500 gp worth. This is enough to discourage casual use, yet allow a powerful character to start a major quest with his items charged up. If it becomes abusive, phoenix dust (or whatever) becomes unobtainable at any price. You want it, quest for it!