Applications to improve rankings/SEO

I've seen many, many applications out there - claiming to help improve
SEO. A few claim to have technology to submit your site automatically
versus manually. Without getting to specific about the products - why
would I want to spend a lot of money on any of those software - that
claims to submit my site to mulitple sites (and really, it's up to the
accepting sites not the software - to link) or improve key word
ususage - when I can just use the free webmaster tools on
search.msn.com, yahoo site management, or google analytics - to name a
few?

Note: I'm not trying to challenge the software as being useless - I'm
just trying to understand what I would gain from using it.

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