Having the right mix and the right amount of inventory on hand is paramount to customer satisfaction. Your collectors and new customers want to see "fresh" products all the time by virtue of the way the world works now, from jewelry to art to other merchandise. Make it as easy as possible to present your target market with the artwork and items that provoke buying behavior every time. Activities such as storing, counting, and reworking inventory items tie up time and resources... and when you are using multiple platform? It's a recipe for administrative frustration.