Keyword Density and Private Label Rights Articles

I’ve been seeing quite a few websites offering private label articles with proper keyword density (the most commonly accepted percentages, between 2% and 4% for the keyword or phrase). Now, I thought it was a good idea at first. . . but when I really thought about it I had a different opinion.

I wrote a little spot on it:
Keyword Density and Private Label Articles: A waste of time and money?
Not that I think getting proper keyword density is a waste of time, more that I think paying extra for proper keyword density in something that you are going to edit is a waste of time.

I dunno, that’s my opinion. What do you think?