If you don't want ads then don't use the app. It's not your God-given right to use an app that a developer worked hard to create.

If you want to display ads in your app, you can display ads promoting your products, or sell ads by yourself, this is what I meant with "do something clever when connected via wifi".

Maybe in the country you live the mobile internet is cheap and unmetered, but the appstore is international, if you don't want to deal with international users, you are free to lock your app by region. It's not your God-given right to use the user's data plan as you wish, even worse, in some countries you are going to waste your user's money in many orders of magnitude to perceive a cent (or less) for a banner.

If you are not going to care about your users, then don't complain about users not caring about your efforts.

>As a user I'm not going to allow your app to waste my limited data plan with ads, learn to cache them, or do something clever when the device is connected via wifi.

You have the option to NOT use the app. You are not entitled to free ad-less apps created by other people's toil, anyway.

I didn't said that I want an ad-less app, I said that I don't want to have ad traffic wasting precious megabytes, not everyone lives in a country with cheap internet.

For various reasons, ads can not be easily cached.

Ad networks impose their restrictions, but if you can guarantee an amount of impressions, you can start selling ads by yourself.