If a site author accepts high quality guest posts, should they no-follow the outbound links? That appears to be the message in your blog post.
I added some paragraphs of clarification to the blog post.
If it helps give you an idea why it's confusing: I get tons of spam comments on my site offering me spam content generation tools, among other spammy offerings.
They're obviously spam. I'm sure some people do fall for these ploys, and it's unfortunate. An appropriate message would be "don't fall for these". An inappropriate message would be "if you're relying on content generation in 2014, stop".
In other words, just because something has spammy elements, doesn't invalidate the practice entirely. What's still unclear about your blog post is this: If someone does legitimate, high quality guest posting, the kind they would do without Google, is this a positive or a negative in Google's eyes, and should links be no-followed the same way you'd do for a high quality affiliate or high quality sponsor.
Having a well-trafficked blog of my own, I also receive hundreds of these awful spam emails. But why would I ever take their offer? My blog is respected by my niche because I would never post junk. Niether would the publications I write for. That's why there's still an audience there.