National Public Radio reports that IBISWorld research indicates that manufactured housing dealers lost $4,538,000 in 2010, which reflects a decline of 73.7 percent in the decade since 2000.  It suggests part of the problem resulted from the housing bubble when people were buying conventional homes, but it also says the industry stagnated from lack of innovation.  It predicts the number of dealers will decline another 62 percent through 2016.