Every once in a while, I will have the tape removed and say a few keywords, then disable it. My hope is to see if I will receive any advertising in with these niche keywords. It's only been a week so far, but I will update the post if there is anything.
(Note I have create a new google account just for it.)
[1]: http://idiallo.com/blog/be-mindful-with-ad-targeting (disclaimer: my blog)