By Jeffrey Dastin (Reuters) – When Amazon.com Inc on Thursday reports how it fared during the holiday quarter, a key question will be if the retailer will finally raise the price of Prime, its fast-delivery and media subscription. The company has every reason to do so, analysts say. Amazon had to pay higher wages and signing bonuses to attract workers in a labor shortage. It had to spend more on shipping because it could not get products into the right warehouses. Even steel for construction projects cost more. Amazon has forecast an operating profit between $0 and $3 billion, with analysts es…