What drives retention
For better or worse, much of the games market is moving to games-as-a-service. Once upon a time, this was known as the MMO business model, because all MMOs were games-as-a-service, and virtually no…
Raph Koster catalogs the major ways to drive player retention with their associated pros and cons. As Raph notes, retention is key to any games-as-a-service model regardless of how (or indeed whether) it monetizes - it just means a game that players want to keep playing.