I'm a little surprised at some of the negative responses. I do not see the problem with the strategy (I suspect such deals will be really hard to find, but I would do them if I could).
Real estate is a supply and demand business. But the concept of "value" is subjective. buying an undervalued house, doing nothing, and reselling can be good business.
An example comes to mind. Way back in High School I really wanted a Ford Mustang (65-68). I found one for sale at a gas station down the street from my house. I was crushed to learn that the guy wanted $2000 for this beautiful car. Way beyond the budget of my 15 year old self. I happened to know that the car was being sold in anticipation of the owner moving out of town...so I waited and hoped no one else would buy the car. Luck won out, the day before this guy left for Alaska I walked in there with $650 and walked out with the title for my new car. It wasn't unethical, immoral, or against the law, it was the first time I solved a problem for personal gain. The car was no longer an asset to it's owner, it was a stumbling block loose end he needed wrapped up so he could go start his adventure. The money I gave him probably fueled him all the way to Canada. Houses are really no different.
There are plenty of legitimate reasons someone might sell below market. These reasons include really needing the money, needing repairs, anything and everything all the way to doing a poor job of assessing value. There is no reason that Saar, if he finds the deal he describes, shouldn't jump on it! Maybe the "value" is ready cash, perhaps it's the relief the seller seeks in unloading what for them is a problem, maybe he just knows the market better. I would happily move on a property in the circumstances he describes.
Back in 2007 I helped my family settle the estate of my Grandmother. Height of the market when everything was worth more the next day. I had to argue with my Aunt on my (to her) high market evaluation of the house. She was sure that my price was $50,000 over the top and that the home would never appraise even if I did find a buyer. Had it been her choice she would have grossly undervalued the property...and no doubt sold it way under-priced. Nothing immoral about that, she just failed to do her homework. Fortunately for her I did the right thing, listed with the right realtor, and sold for a premium. A house is worth what you can sell it for.
Maybe Saar just brings a little extra marketing prowess or determination to the table. Perhaps the seller doesn't do the internet and would never be able to market on CL, Zillow, and Trulia.
We all deal in our special knowledge of real estate, that's what makes all this possible.
Saar, go grab your deal!