One of the advantages of Google custom search is that it allow to monetize the search result pages, but you will need to have Google AdSense account. You can sign in to custom search engine with your AdSense account to enable you to monetize your page. By doing this Google will display relevant ads in the search result pages and you will be paid for clicks and impressions. Note that it may take some time before your AdSense account will work with the custom search engine.Click here for more details http://bloggingpay.com/how-to-add-google-custom-search-in-blogger/