We are not the sellers on MBA Amazon are, were simply designers receiving a royalty.
Customer details are therefore not ours to request or have the ability to re market. The only way to do this is use landing pages to help track all external traffic.
I think this would open up the platform to all variety of spam. Amazon doesn't even let us promote our shirts directly on Amazon. Why would they give out detailed customer information? I think maybe demographics could be interesting but there's no way of really knowing who the designs are intended for.