Pointing domains to another won't help its rank.
If you start advertising and bringing in links for all those domains that point to one website, you're just going to be raising red flags for Google.
Quote:
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Should we point the keyword rich domain to the sub-directory with the relevant content or push the relevant content out to the keyword rich domain?
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Pointing domains to sub-directories just for the sake of
SEO will most likely have a reverse effect.
Not necessarily being banned, but certainly have a lessar weight in the eyes of google