iPad apps where you can earn money

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A while back when I joined a site I saw they had an iPad app, and I now use that to earn money watching ads while I do other stuff on my computer. I've been wondering though, if there were any other apps where you can earn money by using them. I think truthfully this is one of the best ways you can earn money, through the iPad that is. The thing is so blasted expensive to begin with, it gives it full purpose haha. I've been trying to find apps to use to earn money, but I haven't found any others yet. Then again I'm not all that sure how to do my searching. So I guess it basically comes down to, is this an app the one and only way to earn money on the iPad? Besides the actual creating of apps and selling them of course, I have no talent for things like that.