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Just redirecting an otherwise inactive domain (no website, etc.) will not help the site you redirect it to much at all, even if it has DA / PA. Google reduced how much this tactic helped quite a long time ago. If you bought an active website, transferred its contents to your existing site or created a similar-topic area on your existing site, and redirected pages to their most relevant resource on your existing site, you should see some benefit. However, just buying and redirecting domains is highly unlikely to result in your rankings improving.

Just a point here as I just ran into this thread on the "Bounty" QNA section.  Google dropped authorship pictures just about the time this thread started, so being more visual will not have the same impact it once had http://searchengineland.com/google-plays-authorship-search-results-dropping-profile-image-google-circle-count-195163 Honestly, I agree with EGOL, I think using authorship as a tactic on product pages when there is really nothing that you authored.  That just sounds like an approach that will get you penalized down the road.

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