The PR that your site will give will be so low that alone it has no SEO value. It won't be a good investment for someone to do. You will need to grow your directory to be one of the top ten or twenty on the entire Internet for it to possibly become worth it.
stymiee
He's No Good To Me Dead
3,360 posts since May 2006
Reputation Points: 161
Solved Threads: 38
So you want to sell links? Well, your home page may be a PR 5 but your inner pages are not. Plus the amount of PR sent to them via those links will be small as PR is shared amongst all links on the page plus the dampening factor reduces the value even more. Plus with Google cracking down on link selling there is a good chance those links will have no value regardless of any other factor anyways.
The only use those links would have would be for potential traffic if your content is similar to theirs. And never sell links based on projections. It doesn't fool anyone. You can sell links based on your current traffic and if your traffic goes up then you can charge more.
stymiee
He's No Good To Me Dead
3,360 posts since May 2006
Reputation Points: 161
Solved Threads: 38
Backlinks are links on other websites that link to your website - the more backlinks you have, and the higher the quality the sites that link to you, the more Google PageRank your site has.
Backlinks are achieved in one of two ways: Either by paying for them or naturally. Natural links are when other sites link to you just because they've found your site and like it - there is no actual partnership / business relations between you and them. These are the best links to have.
cscgal
The Queen of DaniWeb
19,421 posts since Feb 2002
Reputation Points: 1,474
Solved Threads: 229
Reciprocal links are devalued by Google and are virtually worthless. Even more, reciprocal linking may cause you to be considered part of a link farm which can get you banned.
Unless you are a well established large website, reciprocal links should be limited to sites larger then yours and in the same genre.
stymiee
He's No Good To Me Dead
3,360 posts since May 2006
Reputation Points: 161
Solved Threads: 38