Hi Lynette, I hear you LOUD AND CLEAR about the topic of ads on websites. As a professional web developer I am super careful to make sure that if my clients want the benefits from allowing ads, the ads are as unobtrusive as possible.
I have not seen any ads on WikiTree that are in the middle of pages - the only ads I have seen here are the ones in G2G that are on the right side.
I also fully agree that ancestry ads are undesirable to have on WikiTree, but I don't believe that Chris has any control over what specific ads are put here - they come from google, who varies them and perhaps permits Chris to exclude certain types of content that is objectionable, but if so then the more he excludes, the less they'll pay him. I'm sure they wouldn't permit exclusion of a specific advertiser.
You bring up another very interesting question - if the ads here are pay-per-click then Chris needs to let us know that. I would click on all ads just to give him the payment credit - it doesn't take a half a second to do and you can close the new tab it opens immediately within the same half-second.