Funny enough I just tried it for 7 days, my sales did explode however my game sold for 59p after Apples 30% we get 36p and every time someone clicked my add in facebook it cost me 26p if they bought the app or not! So maybe I make 10p however it was a test. I will say this make sure you select your target users as selecting all is not a good option, old people won't click etc. And cap the amount per day you want to spend, I capped it to £30 per day for 7 days. And I always reached it!
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Have fun mate