Mostly free traffic like stumbleupon.com, easyhits.. But if you consider the traffic from paid directories, then my answer is that I pay for traffic
Yes, I pay for traffic. Of course. It's like any other business, on or offline, with the owner advertising his product(s).
Buying traffic always useless dince those traffic are not your target visitors and they are mon interested in seeing your centent or your products. the chance for them to succeed is even less than buying email marketing. It's totally waste of money.
The only time I see a sudden amount of quality traffic is when I'm hiring. The advertisements that I put out there not only attract people who seek employment with me, but also people who wish to buy my services, I know this is a very peculiar thing to happen. But it does!!! Reply to your answer: Yes Adwords has helped me, the ratio of response is something like this: 6000-8000 impressions which yield 50-100 clicks which in turn yield 4-5 orders. Which is enough money for me to continue posting more ads while making a steady profit.