Thanks for the kind words on the service. On your feedback, here's my take:
1. Stepping back, isn't it more absurd that people are, by default, charged more unless they spend significant time dealhunting? The claim is not that the disparity itself is unjust, just that it's time for this to come to an end.
2. For all of the biggest e-Commerce players (Amazon, Walmart, etc.), their biggest business lines (and ones where they're investing the most) are in the sales of basic necessities (food, household goods, etc.). So considering how dynamic pricing will impact people (esp. re: basic necessities) is important. I'm not sure why you're dismissing the key point so quickly -- if we care at all about helping bridge the income divide, we should care about helping the poorest get the most affordable prices.
In any case, I wrote the article because it really did shock us. Joe is a real person and a friend and we hope it does some good to show a small slice of what we're seeing.