That completely ignores the fact that audience and number of sold copies had grown as well. Games that have once sold 1 million copoies now sell in 5-10x as much. If anything the profits are now higher than ever.
It's third installment, Dead Space 3, was slated to sell minimum of 5 million copies. With less than 5 million, EA decided that it's not going to be profitable enough. It also had microtransactions and DLCs on top of those required 5 million copies sold.
Who's greedy here?