Been my experience that they only take up a hell of a lot of bandwidth, and not so much for clicks.
That's just me and my own forums
, web sites and stuff I've run over the past few years.
Personally, I hate ads (though I too, am a Capitalist and I don't mind people making money
, the more they make, the more they spend, which makes more money and so on....) but... ads generally suck. lol