It's a fair point, but as long as you "diversify your portfolio" it seems reasonably sustainable. And, the product is only as good as the effort you devote to s

It's a fair point, but as long as you "diversify your portfolio" it seems reasonably sustainable. And, the product is only as good as the effort you devote to sourcing...I went through a good half dozen factories before I found one with the options I ended up with on this particular product, and iterated on some of the variables for a few months before settling on what works well in practice. Somebody could duplicate what I sell, but unless you're also a user in this niche (as I am) you might miss some subtleties that make the product good. I have a couple more complex products that have been in "r & d" for the best part of 2016, and I'm still not close to market with them (if I was doing this as an actual full time job then for sure it would have taken less time). There's enough cheap shit on Amazon...I think it's worth doing the legwork to ensure quality.