One of the other purposes of Advertisements are also to create impressions and Branding. You don't have to necessarily click every ad. :)

And with such visual tools ad making is very easy and reachable to all. A great project by Google. Kudos. With Visual tools like this we can interact with more depth. And lets not forget this is free too.

They might bring better ad-making experience overtime with built in ad-templates. All this will bring more Appealing ads.

And Eye catching ads serve as — Branding and Brand-remembering for Publishers, users notice them and remember(clicks not important in Branding)