If I were a retailer, I’d be extremely leery of the largest e-tailer asking me to process my payments. My customers know what they are buying from me. And would the payment processor. And if the payment processor can subvert my shop for their online store, then why would my client come back to me? I know customer service, humaning, and all sorts of other anecdotes are supposed to help, but in the end, folks just want the best quality for the cheapest price. Barring that, if a vendor offers a cheaper replacement that can be delivered to the client’s door, why would they come back to my shop?

And this doesn’t even mention the itemized list of all stock that I might be selling that this larger retailer now knows about me….