If a person wants to promote CPA offer for example an email submit offer with a payout let say $1. So if he use paid traffic of USA with a daily budget of 5 dollars then for 5 dollars the total clicks using facebook ads may be 25 clicks (CPC 0.25 in this case assumed). So if a conversion rate is 4% (which is assumed a higher conversion rate) then just one click will be converted out of 25 clicks. Then it means a person will suffer a loss of $ 4 dollars.
So please explain me what should be a best strategy to promote such offers with a low conversion rate and highest cpc?
Also explain the cheapest cpc traffic sources along with clear explanation of cost per click of USA traffic?