Amazon.com Inc’s (AMZN.O) sales projections for the crucial holiday quarter disappointed Wall Street and third-quarter results missed forecasts, sending the online retailer’s shares 9 percent lower on Thursday. After an unusually busy first half of the year that saw the online retailer spend on developing everything from mobile phones and Hollywood-style production to grocery deliveries, investors were ready to see it curtail its ambitions and start delivering sustainable profits. Thursday’s after-hours share losses wipe more than $15 billion off of Amazon’s market value.