Can you really make money with iPhone apps?

Can you really make money with iPhone apps like Checkpoints, Gigwalk, We Reward, and Juno Wallet? If so, which one is the best? About how much money a month can you make this way?

Trust me your making them money. I've tried these and they don't work hardly at all and if they do work then the amount of money is so little it's not even worth your time

You would have to put a ton of time in, no one just hands out free money.