*** I purchased several (30+) keyword domains in hopes of accruing more visits (and thus business) for my client. ***
Creating mini-sites is a big no-no for google and others. You can sometimes get away with one or two (if you are a Big Brand), but 30 is a big red flag.
*** Domains purchased would be like www.chocolateicecream.org, www.icecreamscoop.biz, www.wescreamforicescream.com, etc, etc. ***
Domains like that are usually not much good for keywords, as the words are seen as one long word allruntogether.
*** Now, originally I made the foolish mistake of just parking these domains on top of the main domain. ***
As you discovered, Google filters sites out when there is exact duplication like this.
*** So, I fixed my mistake by creating 301 Permanent redirects for each of those domains. ***
Yes. That is the best thing to do.
*** Instead of just redirecting them to the main domain, I instead redirected them to the main domain as follows: ***
*** www.icecreamscoop.biz -> www.icecreamstore.com?site=icecreamscoop.biz ***
That, has just created a new Duplicate Content problem. The root index page of your main site now has multiple URLs. That will cause you a lot of problems.
*** Now, the redirection is working as expected, HOWEVER it seems Google in particular no longer visits the sites and reindexes them. ***
Once a URL issues a redirect, that URL should be deindexed, and the target URL should usually be re-indexed in its place. In this case, however, the target URL is a close Duplicate of the root index page, so it will be filtered out too.
One correction:
*** If your pages have no changes after several attempts to recrawl, the spiders will skip that site completely and eventually it will fall down or even out of the rankings. ***
That's not really true. I have pages last edited in 1997 that still rank.
*** The only value of having those domains is to stop someone else getting them; there is no SEO value in duplicate domains, and, as you've discovered, some distinct downsides. ***
There is one other benefit. You might use one in print media advertising and measure that type-in traffic to gauge the effectiveness of the ads. The type-in URL would redirect to the real site.
I use additional domains (as redirects) for type-in traffic, and to stop typo-squatters owning names that are too similar.
*** Set up plain vanilla 301s, and move on to some serious SEO work for the one domain that matters. ***
Agreed. And, it doesn't matter *where* you set up the 301 redirect: in .htaccess, or in your Control Panel, the end result is still the same. A 301 redirect is a 301 redirect.
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