This won’t increase your SEO.  All you do with additional domain names is alias them to your base site.  My base site is http://www.evergreen-implement.com.  I do have one alias to make things easier and that is http://www.eiijd.com.  

To increase SEO you need more pages, more content listing your keywords, more links into your web sight.  And then some!

@kimberlycarlo We purchased additional domain names for our carpet cleaning business and I haven’t found it to put us any higher in the rankings.  I think @trudyd1474 and @deairby are right.

I saw someone do a ‘trick’ with URL’s, but it took a lot of work. 

First URL is the MAIN site

2 or 3 SECOND URLs with keywords that are a subset of MAIN site and links to MAIN (need to generate content for these sites)

2 or 3 THIRD level URLs with keywords that are a subset of SECOND site and links to SECOND (need to generate content for these sites)
then blogger and wordpress(dot com) websites with news feeds for content and pointing to SECOND.
this was to trick Google (trick Google, bad idea) into seeing your MAIN site as an authority site. 
Also, you have to build this in reverse order, news feed sites first – a week later SECOND and so on.

@kimberlycarlo

I would be very concerned about an SEO company that’s talking about meta-tags or buying additional domains to improve SEO. (Caveat: we offer SEO, so in some ways I’m a competitor. Also, there may be something lost in translation from what they said to your question, like the old game of Telephone. That being said, here’s my experience/belief.)

Multiple domains that point to the same website can actually HURT your SEO as Google may see them as duplicate content and different people may link to the same content, but on different URLs which actually dilutes your SEO.

I’m not sure what you/they mean by “tags”, but there are two main meta-tags. The first is meta-keywords. Those haven’t been important since 1997 b/c they were an early tool for people to spam the search engines.

The second is meta-description. Meta-descriptions have little to no impact on your search engine visibility, but appear as the 1-2 sentence description beneath your Big Blue Link on Google, which is like a free ad for your page. But like I said, little to no impact.

If you are starting a new site, there is some benefit to choosing a domain that’s keyword rich, because that can help, especially as people link to it. However, you can only optimize for that one thing.

Taking a quick look at skh.com I’ll say that your home page title, THE MOST IMPORTANT VARIABLE IN SEO, is “Stauffers of Kissel Hill.” Now, I’m sure you rank well for that, but who’s searching for that except people you already know?

Compare that to “Supermarkets & Garden Centers in Central Pennsylvania | Stauffers of Kissel Hill.” If you’re optimizing for “supermarkets” or “garden centers” (which would make sense, as well as dozens of other phrases,) the second title will GREATLY outperform the first. 

There’s a lot more that you can do, but if you go in and improve the title tags on each page, you should see an uptick in your rankings w/in the month or sooner.

That’s a much better approach than buying domains, in my opinion.

@kimberlycarlo @mac I think mac is talking about creating a link wheel.. that’s too old a trick that doesn’t work anymore..Google has become much smarter over the years.. People used to do link wheeling in 2009s and would buy link farms (websites that are mainly backlink generators) to get their websites ranked high on Search engines. Google has become very tight on backlinks on link farms, these could hurt your rankings rather than help.. The only way you are going to be ranked high on search engines is by having backlinks on good quality sites.. It’s the quality that matters NOT quantity.

@rich-brooks is right about a lot of things.. meta tags are only important in the description of your search results.. So, users know what your website is about when they see it search results.

Some other things that can help are http://magnaleap.com/2011/08/31/search-engine-optimizationseo

@kimberlycarlo I agree wholeheartedly with what others are telling you in this post. In my mind, there are only two reasons to purchase additional domain names. One is to prevent others from getting them. The other is, as @margiemintz notes, to make it easy for folks to find you when you have a commonly misspelt domain name.    

@donnaduncan @vinil-ramdev @robpeck Thank you all for your input. It seemed strange to me that purchasing domain names would be a priority for SEO.

I think I’m going to focus on our titles, meta descriptions and content on the site so that it’s all keyword rich and relevant. 

You can get one but make sure it is relevant. I purchased one and run a blog, and it seems a nice technique to me for optimization