Doorway pages

[Andymac]

Can anyone help on a basic point? Various seo software packages and 'professionals' advocate use of doorway pages to appeal to different engines.
Why do the sites that frequently occupy the top positions not use them? Google actually discourages their use in their own tech blurb

Thanks

[teeceo]

to make it simple, don't do it. You could get your site banned.

Teeceo.

[seoRank]

'When' they detect, SEs penalize doorway pages. However, I have seen sites 2 years old, having 1000's of doorway pages getting ranked top in Google with competitive keywords.

I guess one cannot tell when their algo wakes up.