It's an interesting question.
Here's the thing. If you're talking about articles to submit to like EZA or whatever then they're really not worth that much for a few reasons:
1. EZA is mostly used to promote other monetized sites. So the articles don't really have to be that good if you know what I mean.
2. EZA is not an authority on anything. People don't go to EZA to learn about stuff. In fact, most of the articles on EZA are skewed toward whatever product they are trying to promote/sell. No one wakes up in the morning and says "hey, I want to learn about forex/chess/painting/history/coding/dog training, I know, I think I'll go read EZA!" No. Most of the articles on EZA are BS anyway, written by internet marketers who know the secret to making $1,000 per hour on Forex, or who cured arthritis, Tourettes, and Parkinsons disease with "one simple secret!", or who will teach you to fuck supermodels even if you are ugly!!!11!!!one!
For both of these reasons, EZA articles are really not worth very much.
You can be a master of some subject area, but it's not going to matter for EZA. I'm not sure if I'm phrasing that correctly.
Here's another example. I know someone who writes fitness articles for a popular magazine. He's a respected expert in the field. He gets paid in the hundreds of dollars per article. He could pour that same knowledge into an EZA article pimping some stupid IM product, but why? It wouldn't be worth his time.
It takes 10-15 minutes tops to write an EZA article, and that's if you don't even know anything about the subject beforehand. I do them myself because no one who's an "expert" in the subject matter is going to want a reasonable rate for it, and IM articles are so shitty anyway that as long as your grammar isn't completely atrocious it will likely get accepted.
Sorry, I'm being overly verbose without contributing much additional info (which is ironic because that's how you write EZA articles anyway, lol, I crack myself up!). Here, this is a good way to put it:
In other words, if you can find someone who will do it for $2, or if you find a subject matter expert who will do it for $500, there's not going to be any difference in the amount of hits that it gets, or in the amount of traffic that it converts. Remember that you're likely selling to the 80% of people, not the 20% of people who are intelligent enough to go get their info from respected sources.
Now, there are times when it's worth hundreds of dollars to have someone write something for you, for example, if you know some master copywriter who can write excellent landing pages that convert well. But if you're just talking about articles to promote your site posted at like EZA or articlesbase or helium or articledashboard, there's not going to be much difference between a $2 writer and a $500 expert.
Addendum: in the off chance that you are talking about having someone write articles for you for some sort of expert site or something, then yes, you're probably going to have to pay more. For example, if you run a site about advances in neurological imaging technology, then having morons write $2 articles isn't going to cut it, and you're going to have to pay a lot more to get experts who know what they are talking about. But then again, if that's your subject area then you're probably not trying to sell some bullshit internet product anyway (zomg acai berry cleanse!) and you're probably operating on an entirely different level anyway.
edit - this post is brilliant and should be stickied.