I'm too busy or something
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Click yes and when it takes you to the page to rate it, click back. It won't bug you again
Has not been my experience
It has been my experience. Google Play has no way to communicate back that a rating has been made, so all apps I know just assume you rated and never bother you again.
Maybe you're just using really sketchy apps, but for me it worked every time.
Seems like after an update or two they always ask again. Reviews are tagged to versions so I think they want fresh reviews.