A Las Vegas housing analyst said today he expects sales of existing homes in 2010 to mirror those in 2009 and predicts prices will increase by more than 3 percent by the end of the year. Dennis Smith, the president of Home Builders Research, said in a seminar held over the Web that existing home prices will rise by $4,000, or 3.3 percent, from $123,000 at the end of 2009 to $127,000 by the end of 2010. Prices have fallen nearly 60 percent from the peak of the market.