Unfortunately I do not find it too useful. I buy from a lot of places, Amazon represents perhaps 5% of what I buy so your product doesn't add much for me.
Have you considered creating an app which has a barcode scanner which populates the item database? It was my understanding that barcodes were unique to each item. Is there not a way to pull the item name from a barcode?
This seems preferable to having only Amazon or online retailers. Your current solution doesn't do much to help catalogue the hundreds of items laying around my house.