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there are lots of "other ways".I mean you could just market your product to the subscribers,do join ventures with other websites related to your website,or promote affiliate programs.
I dont know of any ways to add advertisers since I havent tried an opt in list yet.But I gotta say one thing.You should get more subscribers if you want decent revenue.The more subscribers you have,the more your advertising rates,and the more money you make.
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