Yeah, I'm one of them. I won't install applications that contain ads.

How should they make money, the developers?

I'm not being hostile, just inquisitive.

Letting the user pay for the game, or at least allowing the user to pay to remove ads. I will usually pay to remove ads within the first 10 minutes if the app seems like it is something worth using within that period.

I have added an option to remove ads permanently for $4.99. So that's a good feedback :)

By charging money for the application. I'll buy an application for money, but I won't install one that includes advertising code.

Or, even, make a trial version and allow people to pay to upgrade for the full version.

Or do all of the above -- have an advertising version and a version without ads that people can pay for.

By selling the game?

Really? Should I rely on microtransactions then?

Have you considered some kind of demo level and pay to unlock the full game?