Dividends and overall investment income increased for wealthy Nevadans in 2010 but capital gains and interest income were down, according to a new report.The Private Bank by Nevada State Bank released its fourth High Net Worth briefing, which contrasted 2010 data with information from three previous years. It was done for the bank by Applied Analysis, a Las Vegas-based research firm.“The trends witnessed in Nevada are relatively consistent with those being reported nationally,” said Jeremy Aguero of Applied Analysis, the managing researcher on the project. “However, Nevada’s impacts tended to be more extreme both on the way up and the …