Monopolies are bad, and since all the people on HN are the small business owner (or want to be soon), making people aware of what's going to happen is kind of important.
It's also not new: there are players trying to do this type of thing in every industry. You even see it in medicine.
If they become the only middleman, than the situation gets much worse as there are no longer any market forces to keep Amazon's prices to be close to their costs. The only force at that point is Amazon's good will to not make a profit.
"Last year, combined total volume of merchandise handled by Taobao and Tmall surpassed 1 trillion yuan, or about $160 billion, according to Alibaba. That figure was larger than Amazon’s $86 billion, according to RetailNet Group, or eBay’s 67.8 billion"