I printed a copy for my husband who is just starting to get into the ezine publishing field with his own fishing ezine. It's not a typical article but can be made into a regular feature. Whether that is a positive or negative for an ezine I think depends on whether the ads are targeted and useful to the readers. Sometimes I find that when I'm done reading a particular ezine the most important thing I got from it was the advertisement in it. Especially if it resulted in a great bargain or some secret knowledge that I didn't possess before.
Editorials are a great idea.
You also bring up the excellent point that if advertising is relevant, it will be much less annoying to your readers and may actually be a valued source of content. Check out the tip on Sponsorship Relevancy from a couple months ago for more on this. New people get interested in the message board discussions this way and join in and the people who's posts I quote feel like celebrities for a day. Really works well for everyone. Reprinting the content from your message board or discussion list makes your ezine's subscribers aware of that community.