Improve ranks by resubmitting every month?

[blackhat]

Just wondering, i have been looking at a few SEO programs and websites and major search engines, and it seems a lot of them offer to resubmit your website to major search engine every month or every few months. Does this affect your ranking? if not why are SEO companies charge a fee for it and offer this service?
I always though once you submitted your website its index on the website forever. please correct me if I’m wrong.

I think resubmitting might make your website look like spamming.

any thoughts?

[general]

you are correct Submitting to the search engines it will effect in decrease in the ranking and just link spamming....

[Amy.Sarin]

See, Ideally, there is not need to submit your website to the search engine... not even once.

You submit your website to the SE to make the indexing fast. once your website is indexed, there is not benefit of resubmission.

Instead, ping the search engines frequently to make the crawlers visit frequent.