in admob, for all ads, you have a description field.. put some interesting keywords there, but keep it related to the app.
also the refresh rate of ads are important. initially i thought more ads are better, but i tried different setups, and got what was suitable for my apps. each is different.
try playing around with them. oh, and enable graphic and age based ads too.
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It's sad but I have to say SellARing is scam! Why? I joined their ad network on August and I earned total $150 but they never pay me a cent. I emailed them to ask why and they said they need to get money from advertisers first. What's the funny answer? It's their business, not mine. So it's a warning for everyone who want to use this terrible ad network.