The mass population tends to prefer quantity over quality. Which isn't that crazy because would you rather have like 5 guaranteed amazing AAA games each year, or tonnes of variations of indy to AAA games? Some being great, others being wasted digital space.
I think their secret his way more obvious than that :
FIFA : The microtransaction dream (Yearly Edition)
You got it. Quantity. More new versions of games each year, and more to do in each. Even if that more is spending more money lol.