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buckworks - 3:08 am on Oct 7, 2002 (gmt 0)
There's lots of overlap in the research for SEO work for your site and the research for an effective PPC campaign. You can put the same knowledge to work in both ways; there's no need to wait if you can afford $25 or $50 to get started. There are some good threads around this forum about effective PPC campaigns. Many of the threads contain the term ROI (return on investment) so if you do a search for that you'll turn up some profitable reading.
I agree with everything Chef Brian said except the bit about waiting so long to start advertising in pay-per-click search engines.