The need to address customers expectations over time when it comes to providing spare parts and accessories, especially when the main product is phased out, leads to a catch 22: keeping old stocks on hands takes space and immobilized cash, but is a real asset on the long run to bring lost customers back to you. The question can be shared based on 3 different aspects: - the CFO's point of view (inventory write off Vs. purchasing value) - the supply chain and sales point of view (the hassle of keeping those stocks Vs. The resale price increase) - the customer's point of view: who can provide me with the parts I need, regardless of the price