Actually google frowns on paying for inbound link. The only question is how they detect and enforce paid inbound links. And it is also a thin line between listing on a directory (by paying) and paying someone to have an inbound link embedded in some content. Until google has a way to differentiate this, I guess there is still a huge market for paid links.
Directory links are generally categorised, and once the links go up they stay up. Paid links are generally not thematically related, in a cluster of 10 or so and change on a monthly basis. Think about it, if a webmaster awards a link soley on merit due to good content he's not really going to change it on a monthly basis. Combine this with another 9 or 14 links in a cluster that also change on a frequent basis hardly signifies a collection of links that are there on merit alone. Add to this them all being tucked in the footer, or together in the sidebar it's alot easier to see how Google can devalue 90% of paid link schemes. Also the thin line between a paid directory link and paid regular link is, the directory charges for the time/effort to review a link for inclusion. So you are not paying for the link but rather the review process. As time goes on alot of directories will be devalued and made basically worthless. As it is now, how many directories come up in the top 10 for a search query? Basically none, including DMOZ's PR8 and other similar authority directories.
If that PR8 page has only one outgoing link on it which is your link, then you will get a PR8 on next update.
Do you know much about algorithms? Can you remember every page on the web and list the top 10,000 when i ask you a term? You cant be serious if you think when the current document version is different then the cache version, and the changes are a grouping of hyperlinks Google wont know. Especially when the core of Google search revolves around hyperlinks from document A to document B. Really, please tell me your post was a joke?
it will make your site pr6 if your site's content releated to pr8 site.And pr8 site must has 10 outgoing links at most....
You couldn't be more wrong. It will give you a very nice boost in serps, I have serval pointing to various websites and it helped a lot for sure.