Hi ,what is disadvantage of directory submission ?

From an SEO perspective, it depends:

1) If your site is about cars but the directory is about fish, you dilute your site's content as the search engine's don't know what your site is about. End result? You lose your ranking

2) If the site is a spam site and you submit there, their link equity transfers to you. In other words, if they are banned, you could suffer from it.

yawa-ti-de

i always LOL each time you answer these "bot profile" questions

seoexperts and e07.net are xrumer or zennoposter bots with aim of creating backlinks. ever notice they NEVER reeply in their own threads?

For getting visitors ,Good ranking for the websites Directory submissions is best,You can use the free Directory list in Google to submit,It helps you to get visitors from Particular category ,those who needs the service of your site ,surely visit ,this is main advantage also this is free method, you can also get the Traffic Blazer SEO service from Tucktail.com it will submit more than 200 search engines and Directories to get traffic.