> If 1 out of 100 impressions leads to a purchase it's alredy a good performance. But do they at all take into account the fact that probably about 50 out of 1

> If 1 out of 100 impressions leads to a purchase it's alredy a good performance. But do they at all take into account the fact that probably about 50 out of 100 ad impressions lead to an "I'll NEVER purchase anything from the purveyor of this ad-spam shit!" reaction?