[sarchertech]

>but it's definitely on average much higher than 5% (I sell this technology and look at the results many times a day)

I think you'd have a very hard time accurately estimating a true success rate because of the number of people who will just bounce off and give up after a maybe successful response. There's no real way to know whether the response really solved their problem other than doing surveys. But survey responders aren't a random sample.