My understanding is that you have to subscribe/pay for the business version of Word Press in order to use any of the monetizing functions. I think you should clearly state this in this article at the beginning. I think there is a degree of bait and switch here if people are just signing up for the free subscription and then finding out they have to pay for a subscription to make money. I am ok with that, it just needs to be stated up front everywhere.
For example, Erica Tannen, a former retail executive and founder of The-e-list.com, describes her site as “an excruciatingly opinionated guide to the Connecticut shoreline and best Connecticut shopping.” The hyper-local blog, which now has over 16,000 free e-newsletter subscribers (the money comes from ad revenues) and 74,000 monthly page views, includes reviews of restaurants, shops and tourist attractions, as well as notifications about sales and events.