I was excited because I hated dealing with Amazon, but I had the call with the Walmart rep and he couldn't cite any benefit over Amazon.
Would Walmart take a lower fee? No, it would be the same as Amazon.
Would Walmart give back its fee if the customer sent the product back for a refund? No, Walmart would keep my fees and have the same perverse incentives that pushed costs onto the vendor.
It was surprising how much hubris Walmart brought to the discussion. The constant tone was, "We're Walmart, so obviously you want to work with us."