I've always promoted evergreen products -- Related to health, relationships (love) and money --- that's what most people are looking for by the way. To be healthy, wealthy and "Loved". I'm not saying the other niches don't work, actually there are tons of products with a low gravity that not only convert well but have low refund rates as well. However I do prefer to promote products that I've learned to master. Each niche is different ... jumping from one to another is just like changing your job daily, believe me... Al.