They may not want to deal with multiple offers and showing the home so they take a lower price, they may like a cash buyer over a bank financed buyer, they may be going through an event that requires liquidation of assets (divorce, etc).

@David Martin lenders want to see liquid assets so that if the property can not be rented you will be able to continue to make the mortgage payments until it is rented.  

I've sold homes with basement walls caving in, water spraying, and spiders larger than the cave scene in Lord of the Rings. 

You're not taking advantage of anyone, you're actually providing a financial vehicle for them to liquidate an asset quickly.  

Obviously, I want to maintain as much liquidity as possible so I'll be ready when the next great flip deal is available. 

There used to be a smoker there because when I sprayed the windows, yellow liquid ran down. 

The role of FNMA and FHLMC is to provide liquidity, so that mortgages will be readily available to homebuyers.Before I get into any specifics, it’s important to note that underwriting guidelines and federal rules and regulations change frequently.

If the water doesn't spray everywhere when you turn on the meter then it is probably the roof.  

The seller has multiple properties that he is trying to liquidate in order to qualify for his benefits I believe, so this particular property has to go.

I currently have around $20k to use (cash, liquid) to invest in rental.