Wikipedia will happily include every obscure city, animal and flower species on Earth (see http://en.wikipedia.org/wiki/Schizothorax_yunnanensis_yunnan...), but will try to delete articles on bloggers and singers that are very well known within their niche.
I don't get it. Adding additional pages to Wikipedia does very little to reduce its value and plenty to increase its value (always coming up first in Google to give a basic overview). No one is going to read or print the whole thing anyway. Whether it's 3.3 million or 13.3 million articles doesn't seem to make a difference.