As I stated in the article my issue with that is they would only have to buy in once. Normally ad revenue is continuous because it's pay-per-click. Advertisers powering up wouldn't constitute on going revenue.

Another issue is what kind of visibility could they expect? Who would up vote an ad-based article and what prevents it from being down voted into oblivion?

Why not let content contributors sell ad space on their articles? Let them have a pay-per-click price that they set. That way advertisers have to constantly buy steem and contributors have an extra incentive to write quality content.