There is so much fail in this thread. Sigh... I can show you literally thousands of instances where niche edits absolutely murder it, even in some of the biggest niches on the Internet. I have clients who use niche edits exclusively and still bank. Clients who do 6-7 figures PER MONTH! I don't say this because I sell them...I say this because people who claim they don't work, are either 1) not doing it right 2) are neglecting their on-page or 3) make one order and see no movement and automatically assume they don't work (PSA - every website reacts differently. Some see movement instantly, some in 30 days, some in 45, some in 2 months).
High-quality niche edits work. Period. Don't listen to the noise.