According to Bloomberg News, very.

His return to the Cleveland Cavaliers will generate as much as $215 million annually in new and redistributed money for the franchise and Cleveland from tourism, taxes, service industry spending and the team's business, according to data compiled by Bloomberg News. The largest financial impact of any current NBA player is more than the cost to convert the downtown Ameritrust complex into apartments, hotel, office and retail space, and more than double what Alcoa Inc. spent to rebuild a 50,000-ton forging press at its Cleveland Works.