I actually think it's the opposite.
Blogging done right can be SO much more work. With an ebook you write it and your pretty much done.
With blogging, you write a post, then you need to promote it, comment on other blogs, network, get comments, reply to comments, get it social shared, reply to social shares. Just more to it.
One can take the easy way with blogging and just write posts, with little to no comments, but that sure won't grow a blog. Plus a blog without comments is like a ghost town.
Course, just my opinion.