1. I'm certainly not going to ask anyone to define whatever-the-hell "quality" means, and I'm also not suggesting that there is necessarily a direct correlation between "quality" and the cost of a ghostwritten article, but in what ways might a $25 article be "better" than a $5 one? Again, whatever "better" means.
2. In your experience is the trend line linear, exponential, or logarithmic? What I mean is...
Does an article of $25 quality caliber get 5x the results of a $5 one?
How does the situation look if we compare a $25 article to five $5 articles?
3. What do you do with articles of such high "quality"? I doubt that simply submitting to ezinearticles is enough to get enough value for your money, but I'm open to being wrong