The PageRank Google assigns your pages is one of your most valuable
assets as an online publisher. Your SEO success on Google is dependent
upon earning and maintaining PageRank.
In every sense of the word, doing so is a balancing act. Hoarding your PageRank is not good; not providing any links to other
websites can be viewed as an SEO sin and it’s difficult to get other websites to link
to yours when you don’t link out, in turn making it more difficult to
earn PageRank in the first place.