It appears that at lest so far, this only applies to collectible items; the kind of thing you might be more likely to sell on eBay than on Amazon, or perhaps of

It appears that at lest so far, this only applies to collectible items; the kind of thing you might be more likely to sell on eBay than on Amazon, or perhaps offer for sale on Amazon so that it will show up on searches, but then do the haggling offline once you've found an item you're interested in. Adding the "Make and Offer" button for these kinds of items could increase transparency, as it keeps Amazon in the loop and all of their standard policies apply like free shipping, so you won't get into situations where you go offline, negotiate a price, then get hit by hidden shipping fees or something of the sort.