Ask HN: How to make Facebook App Install Ads work?

I have an app for which my net revenue per download is $0.62 (calculated by dividing monthly revenue by number of downloads). Facebook ads for this app cost an average of $5 per install. I've tried FB ads a few times with different messaging, but always gave up in a week or two after seeing the amount it's costing me. Is there any way to make FB ads work for this app? Are there any benefits other than just revenue to consider when purchasing FB ads?