Yeah, I get what you're saying, I don't know the answer, but I've wondered the same thing. You'd think an article would be worth more than an icon because it takes more work, but then again, how can they really measure it?
i couldn't say articles as i don't write many, but if you were add like 20 images to one spot and 20 articles to another, i'd Imagen you'd get a medal for the article spot, i think it works with the harder it is to add to the spot its worth more, for example it's not hard to type into goole pictures of cheese (for the cheese spot of course) but imagen trying to write an article about something.
so yeh, i'd say some things are worth more than others.
