i like that idea and it should be workable, however it does sound rather time consuming.
most ads pay per click or per sale. you won't get paid simply by displaying them.
it is not easy to make money from ads. you will need find ads that are aimed at your targeted marked for best results. placing of the ads also makes a lot difference. getting those two right alone won't bring any real money on their own either. on the internet "build it and they will come" does not apply. so a good marking strategy and
SEO is a must.