Talk to Nexon about Elemental Wands/Staves

Can't you just leave it at the fact that all Maple equips/items deprecate over time, and very rarely fluctuate to a higher price (usually in the case of an event, etc that requires a certain limited item. E.g. furies and black crystals).

The older the server after the prices settle from opening, the lower the prices will go on everything, and they will continue to deprecate with the exception of a few commodities, and you should know what they are.