Most of these ads are distracting and annoying because they have nothing to do with the topic. I wouldn't mind seeing them in some posts, if they were actually relevant to the content.
I believe thats what they are testing.
I'm been taking a break from game dev, so have let my sub expire, but it would be annoying to have ads in a paid service.
The ad may be better placed at the end of the topic.
Also if the ad being content relevant works as well as the forums search engine, then they will be testing forever.