$5m per year, not month.
The numbers look more reasonable now, but ultimately its a hard sell especially when Apple doesn't actually need to make a profit for its accessories, but you do. Even then, what's the market look like for this without an Apple. I suspect not very large and its Apple's own marketing efforts that have gotten people interested in these tiny wireless earbuds anyway.
Do you have data to support that claim?
Amazon might sell hardware at cost or a loss, but Apple most certainly only sells hardware when two conditions are met: a) they can make a better device and b) they can make money