Now you always have to keep in mind where your traffic is coming from and why it's worth the effort. Not all traffic is equal and not all traffic will convert on your offer or sale either. If you target traffic that will almost always refuse a call to action than you are pretty much wasting your time.
For most people the goal is to generate lots of traffic for their product or service and produce a general result. This result is most commonly a sale or action of some sort by the visitor that in turn generates profit or potential profit for the host. So in other words you want your traffic to do something when they visit!
Over the years people have used traditional classified ads such as the local newspaper to generate traffic. This could be traffic for something they are trying to sell, a service they are trying to provide or a job position they are looking to fill. Now that people look online now for classifieds now more than ever Craigslist has really exploded in the free classified market.
The reason traffic from craigslist is quality traffic and not just some casual web surfer is because of the nature of the site itself. It isn't an entertainment site or a site to play flash games, craigslist is a site for people to post free classified ads to attract buyers. Almost all of the visitors to craigslist are there to take action or buy something!
Being able to generate visitors who are are specifically looking to take action or purchase your product or service is an amazing thing. This allows you to attract visitors who know what they want and are willing to go after it. This has allowed Craiglist ads to become an exceptional marketing tool for small businesses.