They are the same thing. I have 3 dozen eggs for sale. Buy em or don’t. I might get more. I might not.
How do you expect them to know how many of an item physically exists in the world?
It’s just a store like every other store. The seller sends their inventory to Amazon. Amazon stores it, and then ships it. The Seller doesn’t tell Amazon how many total it has.
You don’t see how many the seller has. You don’t see how many the manufacturer has sitting in their warehouse. You don’t see how many of this item were ever made. You don’t see if the manufacturer can make more, or how many people they will potentially make in their entire existence.
You just see how many Amazon has in stock for sale right now.
Why would Amazon want to hinder the accuracy of the price tracking in that way? I would imagine Amazon wants their 30% cut (Depending on Category) and they want it as fast as possible. Their entire business is predicated on Churn, and Logistics.
In that way - I would imagine CamelCamelCamel increases conversion.
I wonder if the Coupons were shown to increase conversion for the ‘Coupon’ ladies that everyone sees in their local grocer. They only buy when they get a ‘Good Deal’. They’re willing to spend 9 hours to save $0.76 and they never “pay sticker price.”