Let's be clear about this: it's all bullshit. But people still want to be fooled by these scams, looking for the solution that brings in traffic with so less effort.
Why wouldn't this work?
- Submitting to hundreds of searchengines? I only know a few that can deliver serious traffic, the rest is not important. Besides that: if you have some quality incoming links the searchengines will find your site by following them.
- Within a few days or weeks on top ranks for whatever keyword you choose? If that was the case, what would all those SEO companies do all day?