When Amazon has a product in stock, why do they pad the delivery date?

I ordered a new gizmo from Amazon this morning that “usually ships in two-three weeks.” I’d like it sooner, but I’m in no rush. A few hours after ordering it, I received an e-mail sharing this happy news:

“We are writing about the order you placed on June 09 2007. The item(s) listed below will actually
ship sooner than we originally expected…(the revised) Estimated arrival date: 06/13/2007

While I like that they under-promised and over-delivered, I wonder how many other customers are clicking away from Amazon when they see the delivery delay on the item — the product still indicates the 2-4 week delivery date.

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