Should I buy a link on a page with a Google PageRank of 7? I have a chance to buy one for $100 / month. Do you think it would help my site enough to justify the cost? I want to be sure I'll get my money's worth.

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If you buy links for your site, first check the backlinks, external links. If the external links is unrelavent to the site, its PR may decrease at any time. Be sure the is good or bad. Then you proceed.

I personally think you should understand before making a decision.

Think before buying anythings.

These groups are called external links, and although it is essential to improve and your page rank, this is not the only links that are of importance. External links tell the search engines that your website is relevant and valid that people use it as a reference on a particular subject.

If you are not there on that account at a aboveboard rank, it is apprenticed to about-face the table in favour of your competitor, who is. Yes, you may accept a committed audience and acceptable way of commercial ability be acquiescent acceptable after-effects for you, but benightedness of this awful able average smacks of ostrich mentality.