A week never goes by without some realtor or developer knocking on the door or leaving a note asking the couple to sell. The cold calls offer a dazzling deal — a sale price that amounts to more than a 5000% increase from what they paid.
http://business.financialpost.com/2014/11/15/one-way-to-lose-money-even-when-youve-made-5000-on-your-home/