I agree, but as I wrote in another comment here I often fall victim to the same myself. I find it quite paradoxal however, how I spent weeks deciding which sports watch to buy, but how the real estate market here gave us a few hours in deciding which apartment to bid on..

Anyways, I find your point about 30% often apply more to local shops. Price is often a bit higher, but biggest problem is not having a comparable model at the price point I wanted. And with a seller in front of you doing their thing, it's easy to walk out with more than intended.