The number of U.S. homes valued at more than $729,750, the jumbo-loan limit in the most affluent areas, entering the foreclosure process jumped 127 percent during the first 10 weeks of this year from the same period of 2008, data compiled by RealtyTrac Inc. of Irvine, Calif., show. The rate rose 72 percent for homes valued at less than $417,000 and 78 percent for all homes, RealtyTrac said.