Simply put in my own words, Being a witness doesn't just mean you can technically do the job. That is a requirement, but what is more important is WHY are you doing the job? If someone is solely in it for the money, they are not really supporting the Steem community. My goal is to identify people who see the long term vision of Steem and are a Witness to be part of that community, not just profit from it. A Witness only in it for the money will leave, loose interest, or otherwise become unreliable in times when things aren't the most profitable. A true Steemian Witness however will use that time to increase their capacity and rally their followers around them to ensure they grow, even during the "bad/down" times. I hope that answers some of your questions.