Think of it this way: What do you have more chance of hitting, a distant, tiny target or the broad side of a barn? For the sake of search engine optimization, you want your website to be the broad side of barn. The more quality articles, or unique readable content, your website or blog offers to search engines (and therefore the general public) the more exposure your website will receive from major search engines.
Some writers search for mountains of inexpensive private label rights articles and edit them before posting them. These PLR articles might maybe not be the finest quality but something can be increased by the rewriting. These PLR articles are utilized as a result of fact that actually although the quality is poor, they nevertheless have aided attract visitors.