Originally Posted by chucklesnorris

I disagree. I get well over 10 sales a month on a less than 10,000 monthly search phrase I'm ranked #1 for in at least 2 of Google's indexes.

It depends on everything from the market you're in, the keyword it is, your sales funnel, etc etc. If you're constantly split testing your join pages and tweaking your funnel you can boost conversions. If you're focusing on a keyphrase that just doesn't convert then it's more pointless. There's high volume keyword phrases that convert like shit, too. I rather have a low volume phrase that converts really well rather than a high volume one that doesn't convert at all.