Blogging - "a waste of time"?

Why do people consider blogging "a waste of time"? People often ask me: "How much time do you spend doing this?" I have a friend who is a gardener in addition to his day job; he divides the universe into two categories � stuff he planted or will be planting and everything else. I don't think anyone ever asked him how much time he spends in his garden. It�s the same with people who have a hobby; they are immune from the charge. But blogging is associated with internet hence it�s wasteful. Somehow even the big bloggers who have left the traditional journalism in the dust are also wasting their time by virtue of the medium.

OK, let's agree that my blog is indeed "a waste of time" but what are your thoughts on this in general?