** Placing a site on top of search engines:
Our sites are very well ranked on all search engines. On some search engines, this is because we gave money (sometimes to be the only one to bring answers for specific keywords) . But we're also very well ranked on Google because of mass spamming.
99% of the pages we submit to Google aren't real sites. We buy a lot of domains (with explicit keywords) . Then, out of every domain, we do tons of subdomains with other keywords. All related web sites are different. But they only have one page, automatically generated by sets of scripts. These pages have randomly chosen keywords and pictures, and every fake site have links to a dozen of other fake sites. On all sites, there's only one link to a real site. A real user will immediately catch the right link (because it's a big picture, it has a caption like "click here to access the site", etc) . But search engines are crawling.
Googles gives better ranking to web sites that have a lot of other web sites linking it. So we abuse that. All our sites have excellent scoring because fake sites are referring other fake sites. It takes 10 minutes to automatically generate hundreds of fake sites. Apache's mod_rewrite is extensively used. We have an entiere team devoted to reading mailing-lists of search engine software (like ASPSeek... Google uses a lot of ASPSeek ideas), in order to abuse search engines.
So although Google's ranking doesn't depend on money, it isn't fair. It depends on how people are cheating with it.