I got this in an email from Chartboost support. It wasn´t even about the missing close button (which I had asked about before):
<----chop-chop---->
>I downloaded your game to investigate and noticed a few things that you should be aware of. First, we do not allow incentivization on our network. The way you have you more apps page set up, where you reward people to click an ad will cause you to be removed from our network if this is not changed immediately. I understand that you do no want to force feed interstitials to users but you can not incentivize interstitials. Second, I noticed that when a user is on the more apps page there is no way for the user to return to the main menu, almost forcing the user to click an app. Please make the appropriate changes so that we do not need to remove you from the network. When you have a chance please review our terms and conditions. Let me know if you have any further questions. Thank you.
<----chop-chop---->
So they actually blame me for the missing close button as well as force me to take cross-app referral incentives away. Understandably that is nothing they can or will have control over as they are just a third party service provider (one of many).
This is more as a warning for you who consider using Chartboost and taking the job to integrate it. Please stay away and do not use it until they sort out their customer relationship policy. Any ad service should give its customer full freedom and full control over its own property, something Chartboost is currently not doing. They are trying to take control of my app.
For you who want the statistics:
With app incentives I give the user 50 coins to click on an ad. This is in-game coins that the user can use to unlock levels and buy in-game stuff. There is only a 15% chance that you get a full-page interstitial after a game, so very little force-feeding of commercials (which would lower the user experience value).
I am not going to integrate any commercial tool that reduces my app value. The statistics speak for themselves:
Yesterday: 93 impressions, 9 installs.
One of my cross referrals:
491 impression, 78 clicks, 1 install.
So app incentives work, I just need to run it without Chartboost.