Not really. I mean a study that's not from a company that sells ads or is in the chain somewhere! Any studies (I use the term very broadly) that I've seen are all net positive!

I want something from, say, The German Institute of Being Really Honest, who are government-funded perhaps... a few studies from entities who don't have a dog in the fight is all I'm after.

If their conclusion is that people are happier with ads then so be it... I'm happy without them, that's for sure.