 But networking hardware can often see service lives of five years or more, and resellers and computer liquidators might carry products that are upwards of a decade old.End users that use a particular product may find it much easier and cheaper to add/replace an older device rather than take on the costs, business disruptions, and knowledge gaps that occur when upgrading to new products.When newer products are adopted, the used equipment is inevitably liquidated, thrown out or sold back, which creates a robust marketplace.