Online surveys has good conversion. All you need a user to sign up free. But i see that most keywords are higher than £1.5. And for each sign up, you don't get that in return. So basicly if you promote Online Survey sites with adwords, you loose money rather than making money. What are your thoughts?
Are you talking about promoting surveys with adwords? probably better to have these links in adsense ads on your site and make money that way.
They are bad with converting all around. I tried banners, text ads, and google ads. You would think since the sign up is so easy they would convert better.