Advantages of promotion in directories:
More...customers will visit your website
Easier...access to people looking for information
More relevant...message to target groups
Higher... position of your website
Cheaper... advertisement because you pay only once
More
Among 10 most often visited websites, as many as 4 are catalogue services!
(Megapanel PBI/Gemius survey: panel.pbi.org.pl/wyniki.php)
Easier
Reach customers that prefer looking for companies in industry directories and otherwise wouldn't visit your website via Google.
More relevance Business directories exclude random page results
Higher On one hand: rising your website position (for different keywords) in Google thanks to directory links.
On the other hand: directory services are positioned high in Google, so sometimes directory's web address (with link to customer website) is higher on page results than direct link.
Cheaper You pay only once, and your website is registered permanently.