How do you know I don't know that? Please don't create scenarios for me either....You don't know that. Why create a scenario to make a point? For all you know there could be same-day or next-day delivery. There was an appliance store in our town that would deliver on the same day if the item was purchased before a certain time in the morning, To be fair, the same/next day delivery was for items within a certain distance from the store.
That said, I'd be miffed if I couldn't take my purchase home with me. You did bring up an interesting point though. Maybe some folks damaged their item when taking it themselves, and perhaps tried to blame the store for selling a defective/damaged appliance. That would not surprise me at all.
When I needed a refrigerator a couple years ago I didn't choose Home Depot because delivery dates were out almost 2 weeks and it took a couple weeks to get everything because their in store stock was next to zero.