[kylealden]

We get great feedback from users who discover the feature and want it to be discoverable without being obtrusive. If you haven't seen the animation, you might be overestimating it - it's extremely subtle and tasteful, just a tiny flip of the pages in the reading mode button when it goes from an inactive to active state.

[acqq]

Even if you insist on the "ad" it still needs to be displayed only to the users that never clicked it, once anybody clicked once, you aren't helping him "discover" it.