It's got very litttle to do with delighting the customer.

Deliveries are planned to within an inch of their lives, routes, timinings, etc planned out meticulously to minimise cost.

Making a collection is a separate process, more often than not, a separate van would be despatched, empty on the way to your gaff, then back again with just your return. I'm a bit out of touch these days, but that's going to cost a lot more than a tenner.