Session IDs and Page Saturation?

[Rocknroll]

I have a very basic question. I have always heard that more pages you have on your site and in Google's database better it is (I believe this is Page saturation). So more page saturation is better for rankings. Now here is my dillema, Is it possible that if a site is usine session ID's, and every time Googlebot comes to the site it finds a new session ID appended to the URL and index it as a "new" page. If a site of 200K pages uses session ID's, it can inflate its "page Saturation" to 1 Million pages in couple of months.
Now to me, Page saturation will help only if all the pages are unique and not copies of the same pages with different session IDs. What can be the downside of using session IDs to inflate the Page Saturation? Please help all SEO Experts. Thanks

[webdude]

I think if you did that, you may be opening up yourself to a duplication problem.

[lammert]

The downside of session IDs is that Google doesn't crawl them well. Read in this thread message#3 [webmasterworld.com].

[Rocknroll]

SO if Google will not crawl those pages properly then the questions is How would it determine that thire is content duplication going on there and penalize me? Another interesting issue is that when I do site:www.domain.com quesy on Google, I just see the URLs listed, not the usual title,description etc and not even the "cached" link below the listing. This makes me believe that Google is not caching the pages. I am sure that million pages with session ID are not helping, I just want to know it can "HURT". Content duplication is one, anyone else? Come on genius people of webmaster world. ANy ideas?
Thanks for all who contribute their thoughts