They are easier and faster to work with than the regular free search engines, which make their own decisions about the sites they'll show to searchers. In other words, you can buy your way to the top . Bids for high ranking may range from one cent to several dollars. You only pay your bid price if someone actually clicks your link to visit your site . That's great value compared to other methods of advertising on the internet.
Listings are usually online in a day or two, sometimes within hours.
You can start with a minimum account and add funds as needed. With well-chosen keywords, you can get your listings in front of people who already have some interest in what you're offering. This is exactly the traffic you want. If your site is effective at turning well-targeted visitors into customers you can make money at those rates, but it's good to do some testing in the search engines which allow penny bids. Bid on a few terms to get started, then add more as you expand your keyword list.