Probably the most important aspect of this, and I haven't seen it mentioned in this thread, is that it's against Google's policy to accept payment for text links... http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=66736 I, for one, definitely wouldn't risk it for a couple hundred bucks a year. Google's penalties are a pain in the **bleep** and something I don't wish upon anybody with a successful site. Or even if you're just starting out, it could take years to recover and build traffic again...if ever.
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