Forum OpenACS Q&A: Re: Google Ads?
A month's exposure of Google ads on OpenACS might pay for a day's worth of advertising on Google. Google advertising includes the cost of commisions given to Google ads.
Seems to me that we can find a more productive use of any space deemed for ads on OpenACS.org pages.
There are many other effective ways of increasing exposure for OpenACS without using a third party service.