There is an ad-space sharing scheme implemented starting version 2.5. The idea is to show my ads on a fraction of the plugin users' ad slots. This fraction would be configurable by the user - minimum 1% max 10%, default 5%. (Five percent means my ad would appear roughly once in twenty of the user's ads). I have extra code to ensure that my ads don't appear more than once on the same page.
If you are not happy with it, feel free to edit it out, or downgrade to version 2.4x. I consider V2.4x fairly feature-complete. So it shouldn't be much of a problem to use V2.4.
I am, however, planning a major revamping of the admin interface in V3.00. This task will cost me a couple of days of precious off-days, which is why I am implementing this ad-space sharing in anticipation.