Just trying to get a feel for those people who buy and sell links... What's a link worth to you or on your site? What's your sites PR? What makes the link worth so much (or little) like site genre, traffic, etc.?
It all really depends on what your looking for. If you want a higher PR than get a link from a website with high PR. If you want traffic then get a link from a relevant website that has a bunch of traffic. I would suggest always asking if you could see the stats if you're going to buy a linik. As far as value goes, the most I ever see anyone pay for a text link is $20 for like a sitewide link on a high PR site (that's expensive IMHO). The main point I guess is that it's all about what your looking for, traffic or PR.
Just make a search in all the threads for your answer because you are asking a general Question and not a specific question to a member.