Webmasters often ask if paid directory submissions worth the money? Of course the answer depends on the directory and the money.
There are two things you can get from a directory: link popularity and traffic. I don’t know of any directories that really deliver much traffic. Listings in Dmoz, and the Yahoo directory don’t even get me much traffic. Still if you’re buying a permanent listing, getting a few visits a year for 20 years isn’t so bad. There’s little doubt that this is targeted traffic.
Then you want backlinks or link popularity. This depends on the directory and the category where your listing will be placed. The structure of the directory categories will determine if your site will get a top-level listing (one or two clicks away from the homepage) or a deep listing (3 or more clicks removed from the homepage). Then it depends on the number of links on that page. Many paid inclusion directories are selling everypage links, but these are a serious link popularity drain.
So the two main problems with web directories are where your listing will be placed and how much link popularity gets passed on to your site. My...