I also include utilities in the rent so adding a second person increases the utility usage and costs me another $30 or more a month.

You also have the added burden of Self Employment Taxes if you are actively participating in the business.In my opinion, you've jumped into a business without understanding a lot of the administrative aspects of it. 

Tom Smith - some craigslist ads are scams.

Contacted the person on the ad this morning and went to view it later in the day.

Not only are you doubling the sqft you're doubling a lot of the work and most likely adding a second story.

I currently have three additional properties on contract that I will be adding in the next 45 days.

That's not a recommendation but rather an ad. 

That sounds like Google should come into play.

For example, it you are borrowing $100k then 1.25 points will be 1.25% of that or $1,250 that will be added to your closing costs.

Then, they have people new to the business dial for dollars from a purchased list of investors that anyone can buy from LexisNexis.They might stick an ad on LoopNet, if the broker has room left on their credit card this month.