Do not misunderstand me, I have tried that saif above with DIFFERENT games over a long period of time. Admob will not track CTR in real time, they will work with some sort of average. If I would NOW change the high CTR game to a higher Impressions, it will for sure raise revenue - as long as admob does no re-averaging - if you get what I mean.
I don’t know how often admob does alter some values for that sort of thing, but just because there is some sort of bidding involved (for advertisers) there has to be some sort of evaluation for different ad spaces. While on websites that is easily done by keywords, there are no keywords on android banners, so there has to be the one or other value involved. And the only value available is the CTR in conjunction with some sort of impression rate.
So a high clicked ad space has to be of more value of a less clicked ad space. For me that is proofed, becaus I see the result directly on my games.
Sure - I cannot push some games to make the ad space more valuable in most of my games, on some of them it is possible (between actual gameplay) and there is the CTR the highest. In the end, everyone is fine, when an ad is seen well, the dev as well as the advertiser.
You do not get any benefit by blindly refreshing the ad having now knowledge why - knowing why you refresh (because you have a good opportunity) will get your ad space more value, than other web spaces - except, when there is low ad inventory, in that case it should be pretty useless, but as far as I can tell, at the moment, there is enough ad inventory, even, when my big games are getting CPCs of < 0.02, I can see a mcuh higher CPC on other games with much lower refresh rate.
I don’t want to tell you, there is a mechanism which will make you rich, I am just telling you, that you can get a higher CPC than those who habe a 60 seconds CPC if you place your ads on the right time and the right position inside of your game / app. The time is right, when the viewer is actually ready to get their attention elsewhere. During a game they will never look at any ad at all - that’s for sure, so it is a wasting of impressions refreshing at that time.