Good food for thoughts! But I will not be the one providing an answer...
Convenience is definitely the key word here. As you said, time can be spared and used otherwise. In some sense, I am paying less not to make any effort, to get my shopping delivered at home and to be able to use that time in other means.
Why shouldn't do it? Huge corporations are not that great, but I am earning something in using their service.
Yes very true. I think we are all time starved and time is perhaps the most valuable resource we have.