Yes, if you need pure in numbers just to increase visitors to your website, you need traffic from Google. But, Google generally send all type of traffic to websites, the majority ends up being sh*t!
If you want traffic that are being turned into paying customers then you need to focus on Yahoo!
We have purchased full rights and ownership on 3 products about 8 years ago. For 7 years Google sent a lot of traffic, but our sales stayed in the $XXXX range, even with Google Analytics for the whole year, each year. Last year we moved to a new company providing services using Yahoo!. This year we have reported sales exceeding $XXXXXX. Our sales per month now reach $XXXX. We spent up to $8000 per month on Google's Adwords, which was a huge waste of money.
We are no longer interested in Google, their search engine or any service they provide. We get less traffic, but definitely more sales and money.