Don't use google adwords if you cannot get back your investment. Yes it will increase your traffic but also increase your operating cost.
If you paid $100 for Adwords to get $2000 revenue, than is ok to continue with Google Adwords.
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Another, will google adwords help in PR?
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Nope, PR depending on your link popularity or how much site has link point to your site. Last time Google update PR once a month, now they have change it to quarter per year.
Jawa