That's why I like it.That's why many people stopped caring about SSG's endless hamster wheel. This is the only game I know that purposefully keeps moving the
goalposts, and removes perks. If they had a "get 10 out of X" formula or something then you keep it, maybe, but not by design just for sales.
Otherwise, it's 'Release expansion, finish expansion in weeks, go play something else until next patch' like in other MMOs.