While you are right about the importance of cleansing and cleanliness, and you may not have experienced success with some zapper, I have personally had great and very fast results when I have used certain zappers. That is the main reason that I now promote them. Even the cheapest zappers can produce positive benefits but the best can be quite amazing.
The same is true for using herbs for cleansing and detoxing. Properly used, they can be a great ally for the production of a healthy life.
As you stated, it is only your opinion that zappers will not work, while it is the experience of many that they can and do work.