The best lenses are those who are to the point "and not full of useless clutter and distractions. This includes content and ads on your lens!
If you promote a website or product, that's fine but keep the ads to a minimum and do not have a dozen different ads. Keep everything nice and tightly focused.
It is good to add Amazon product modules, but no list of everything under the Sun Choose one or two related products.
By giving your lens too many choices of visitors, then they may get confused and press the back button.
