People always use the free parking argument for why people in Sheffield prefer Meadowhell over the City Centre.
It always makes me laugh, as if you park slightly outside the City Centre you can still find free parking and would walk about the same distance you would in Meadowhell, its just people completely underestimate how far they end up walking in shopping malls.
For larger items obviously its an issue, but larger items would usually have a delivery option anyway. Its not like you can fit all larger items in an average car.
Some people are just lazy, I carried my surround receiver on public transport and I have a disability in my hands. I could have had it delivered, but I wanted it NOW. Although I admit, if Amazon had the same warranty as Richer Sounds, it would have been a hard choice.
You can't really blame people for wanting to get the most for their money. Although I do think when it comes to items like clothes, you probably end up wasting more money having to constantly return things than if you had just tried them on in a high street store. But there is also the time constraints, not everyone wants to spend their precious free time in a store.