It's a trap. You, owner of a shop, don't do this. Amazon will first analyze all your sales data, they will than attach reviews to your shop and finally they will oblige you to play by their rules or die (banned or killed by bad reviews) and either way they will grow thanks to your hard work. I'm not joking, this is exactly what they have done (and keep doing) with "partners". Amazon is all but transparent and it has…
I get your comment and agree with it, but... It's funny how us (the HN/startup/pro disruptive audience) is very pro change (let's get rid off the middle man because we can create software that can do this cheaper and more efficient) and now we are 'rooting' for the brick and mortar business. There is a sociological take away somewhere here.
If they become the only middleman, than the situation gets much worse as there are no longer any market forces to keep Amazon's prices to be close to their costs. The only force at that point is Amazon's good will to not make a profit.