If you are searching keywords on Overture and keyword 1 gets 30000 searches and then lists 50 or so combinations of keywords down to 400 searches for the month, where is a sensible cut off point where optimisation/web page targetted to those keywords becomes more hassle than it's worth?
It depends on the products you're promoting and their conversion rates.
If its a high yield product with a good conversion rate you could probably do ok on relatively small traffic.
Products with less commission and smaller conversion rates require greater traffic to provide a decent income.
Plus of course the keywords further down the list could provide a topic for a new page to your site, thus giving you extra content in a niche area. More content is always good in SEO terms.
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