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1. Take every username (or email) and password combination
2. Through automated means, check if they are valid on other websites
3. Record the ones that worked and abuse/sell those as well.
Then again... only a fraction of the audience is really that invested in their save games. The truly valuable stuff (relatively speaking) is all tied to mmo accounts (and therefore not stored on your PC anyway).
Exactly, it would be far more profitable for them to simply steal any saved account credentials.