Days on Market (DOM) is important to sellers because it still takes two to tango. Sellers need to pay attention to DOM because buyers use the length of time a house is on the market to determine (1) how desperate (if at all) sellers may be and (2) what offer to make on a house. A house that has been on the market longer than the average DOM for the area will be perceived as having something wrong with it. Buyers will wonder why it hasn't sold. Is there something unknown about the house?