Well, I just observe if the CTR is not too high. If it is - I check if it’s not to close to anything users click too often and I fix it so accidental clicks are less likely. Although with double click ads it shouldn’t even be required.
I am currently showing House Ads, AppBrain banner ads (few), and Admob banner ads (these consist of the Admob eCPM floor beta and the regular Admob banner ads delivered via Admob mediation).
The Admob banner ads have a 1.5-1.7% CTR.
The CTR for House Ads is 1.5x that for the Admob banner - and the reason that could be is that the House Ads are for another app which is of the same genre.
However the Admob eCPM floor beta have a nearly 2x CTR - these have a poor fill rate - but perhaps when they ARE shown they get higher CTR. This means that the ads which are higher paying usually will also see a higher CTR ? Or is it that the higher-priced campaigns have more money and are able to run better ad campaigns (i.e. better ad graphics - and designed to get better audience response).
It seems the CTR for these higher paying banner ads has gotten 2x only recently - earlier it was similar to the Admob banner at 1.5% CTR or so. And the Admob banner ads also had lower CTR i.e. 0.85%-1.5%.
I had buttons all around the edges of the app - CTR was not too high. But I still tried to add some space between the buttons and the banner ad slightly.
I am a total newbie but still could not figure how to insert interstitials within a gallery of images where users will basically just browse to the right or to the left. My point: which event would trigger the interstitial in such a case?
Perhaps on entry (if there is sufficient delay as you show a splash screen etc. - that would enable new ads to be delivered in time to be shown right after splash screen - for wifi users probably). In any case Admob seems to prefer WiFi users - I have noted that fill rate is higher for wifi ads ? (perhaps the advertisers know that non-wifi will not download an app or go to their website very well if they are on GPRS etc.).
You could show an interstitial on exit - but make sure that it appears immediately (i.e. is downloaded ahead of time) - you can do this with admob interstitials- and with some others as well (leadbolt etc.). The interstitial can be an appwall as well.
If there is a Settings screen you could make it so you show an interstitial after user exits the Settings screen - so it be shown before user allowed to go back to main screen (do this rarely).
Suggested period between interstitial ad presentations - maybe one early - and after that maybe 3 minutes - any shorter and users will start to complain about “too many ads”.
I’ve just realised that showing interstitial on startup could cover the loading screen and make the game seem to load faster (for games that have long loading times) - but users wouldn’t like it anyway, I’m afraid…
What if I have apart from gallery I use another screen of categories? Would it make sense to put an interstitial on the switch between gallery view and “choose categories” view? How often do you think it would make sense to display it?
Your contributions have been very helpful, thank you all!