adsense?

I have promoted a few videos through Adsense...while I did get quite a few views, attracting new subscribers was low. (using the "general audience" option.) Do you promote through Adsense? If so, what audience targeting options do you find the most helpful for your videos? (I am in the comedy...

So I've dabbled with the promotion feature directly from YouTube a little and I gained some views but not really many subs. One video I featured got up to 6k views but 1 or 2 Subs, this cost me around 100 bucks to run this campaign. I'm wondering has anyone found success using this feature? If...