One of my B2B clients does an easy $165-$200k in sales per month off the website with maybe six legitimate backlinks (which I purchased for them in a niche directory) That's it. Most of the rest are scrapers, and an occasional blog site that features one particular product because they think it's cute (and it's not even close to being one of our best sellers) We've increased sales every month except one in the past 16 months.
For myself, I have non-ecommerce sites that get close to a million pageviews per day in season, with very few traffic-sending backlinks. Lots of scrapers (the ecommerce site has those too) but most of the "real" backlinks are media stories that eventually lose freshness or are removed.
Maybe not everyone's idea of success, but I'm okay with it.