No two search engines are alike. Each has its own way of doing things. Each search engine has its own indexing characteristics. If you do not have the time or the expertise to properly submit your website to the major search engines or you do not want to spend a lot of money having your website submitted, then I am willing to register your site for you. I have over 10000 submission sites in my data base which is one of the most complete listings on the Net.
Some submissions do fail and they do fail for a number of reasons.
Another major reason for failed submissions is due to the fact that many search engines tend to change on a regular basis how they accept information. For this reason, I update my data base every week . A number of search engines are dedicated to a particular topic or material class or they are specific to a certain state or to a certain country. If your website does not fit into these specific requirements, it will be rejected. This is another reason why I update my data base every week.