Some search engines solicit payment to
guarantee top search engine rankings, but this is not necessary. Good, standards-compliant website design, keyword-rich content, regular search engine submissions, diligence and patience usually ensure excellent search engine rankings.
Search engines scan the Internet constantly, and as new sites become indexed, others drop off the lists. Routine site management and submissions will ensure that your site remains in the indexes for the various search engines.
Just as out-of-date sites are a turn off for visitors, they are a turn off for search engines as well. A number of search engines can determine how often the site has been updated and factor that into the rankings. A site with frequent updates will receive a higher ranking (and therefore more visitors) than a site that does not update routinely.