Sometimes I wonder if I promote this blog enough.
Writers of all kinds generally need promotion, whether they write for a trade magazine or are a published novelist. If (or when) you get paid for your writing, promotion is often part of the deal. Your magazine editor can promote your writing better just by putting your article closer to the start of the magazine, for instance. Likewise, a major publishing house spends time and money getting people to look at the titles of its writers.
But bloggers and self-publishers are kind of on their own. Self-publishing is often held up as a way of getting a much bigger royalty on your work – except that you then have to do all your own marketing, too, now. Out of your bigger royalty. It’s a business, just like a publishing house. Some writers enjoy this, but not all of them. I think this is one reason the major publishing houses are still in demand from writers.