But great for raw quantities. Also they are excellent for reinforcing brand names and creating curisity in your site over time. The buttons are right above the links used to navigate throughout the site so they will be seen. The advantage of textual paid links is that the most interested individuals in your goods or services will be far more likely to visit your site. With banners and graphical enticements often those easily dazzled will see your site more often than those most interested in your products.
Textual descriptions entice highly topic focused people to respond.
They work in classified ads for everything from cars to houses in traditional media and they work on the internet too.