How important is it to follow the 50% or 2% rule.

[Nate Wilson]

Hi II am a newbie and looking for some advice on a property in Wear Nh. There is a duplex for sale for just under 200k. It generates $2000 on rental income and according to the calculators mortgage, taxes, and insurance would cost around $1000-$1200. Now I know this generates 1% income of the sale price and the 50% rule I would make a couple bucks. But I don't see who I couldn't make money off of this property. In a "perfect world" I would make $9600 to $12000 profit a year off this unit. I understand that will probably never happen. The house was built in 1980 and just recently renovated so everything is in good working order. Has a drilled well, plowing I can do myslef. What other expenses would I have? I understand things break and need to be replaced. I Am not looking to get rich ( it would be nice) but even if I had to dump $5000 a year into it that stil leaves me with $4600-$7000 yearly profits. 

Am I stupid for thinking this way or is everyone out to make the big bucks. 

Also on a side note I would rather deal with more middle class people than lower class, I have seen a couple triplexs in the Concord and Manchester aera that would probably generate more income but I feel like duplexes would bring it better renters. Any advice on this would be helpful