Having different prices for different marketplaces? No, I think that was fine back then (almost ~10 years ago), but not sure about now. And if it wasn’t I guess I just didn’t get caught 🙂. My prices were highest on Amazon, lower on eBay, and lowest on my site. Amazon had the highest sales volume by far though.

You couldn’t directly advertise your website to Amazon customers though, if that’s what you mean. Some sellers had other ways… I think I remember some sellers including a small card in their packages that would say something like “Register your purchase at https://… to extend your return period” (or activate a warranty, receive a coupon code for another purchase, etc.). Or maybe it would ask them to send an email instead of going to a URL (Amazon sellers can’t see their customers’ email addresses). Something like that.