Here are my reasons why:
1. The products offered on Amazon are consumer physical stuff that people like you and me buy everything through malls, shops and now online.
2. Finding products that can sell well is much easier as they can be identified as Best Sellers, New Hot Releases, 4-5 Star Ratings with many reviews.
3. There are 4 ways to make money on Amazon as compared to Clickbank, JVZoo and even Warrior Plus here as both affiliate and vendor.
A. You can promote other people's products as affiliate
B. You can promote your own products leveraging on Amazon as pay processing and delivery process.
C. You can write e-books and publish as Kindles on Amazon
D. You can design your own mobile apps and market on Amazon.
Yes the commissions are pretty pathetic at 4% but I want you to look at the big picture.
Especially the second half of every year due to Halloween, Thanksgiving, Black Friday, Cyber Monday and Christmas And New Year.
So every year since 2014, I have been marketing info products for the first 6 months and physical products for the last 6 months.