The other posters agree, and so do I. If your product is demonstrably superior, people will be more likely to buy it again. In-home demonstrations are more rare these days. People do not want to let strangers into their homes, which is one reason infomercials are so effective; instead of giving a stranger access, you just watch the duplicate demo on your TV, and there you are! However, infomercials are set up for success, and can't be fully trusted. In-home demos are much more informational because you can ask direct questions and try it for yourself. I think the demonstrable quality of the product is more important than the variety.