> It’s an open to all market, and there are certified channels and customers reviews.

How is it certified if they are commingling inventory?

The customer reviews are hard to tell if they are genuine though.

I still like it, as sometimes you don't really care if you get some cheap knock-off good.

But for important stuff like my monitor, television etc. there's no way I would buy them from Amazon.

You must live in a major metro. I live in a medium size town in a rural state, I haven't had two-day prime delivery in years. Typical minimum is about a week