Any system that prevents from stockpiling is a good one in my eyes: unlimited storage, drop, hide and collect later on, ... That would have me focus on becoming wealthy. Destroying on removal or a system of lose items ... it shifts the problem to intelligent resource management rather than dumb drop-and-retrieve.
I remember when playing The Settlers of Catan, when a 7 was thrown all players that held more than 7 resources were to dismiss half of it. The rule was applied for the same reasons: stockpiling ruins gameplay.
