Nonprofits aren't known for minting millionaires, but a few nonprofit executives have pulled down seven-figure pay packages at least once in the past few years, an analysis has found. While seven-figure pay packages are rare, hundreds of employees of nonprofits in the region make six-figure salaries, according to tax returns examined. The Post looked at hundreds of tax returns filed by dozens of organizations and focused on the 55 nonprofits with more than $9 million a year in revenue. Three hospital CEOs, two neurosurgeons and another hospital executive are members of the small group of $1 million earners at nonprofit organizations in Palm Beach County and the Treasure Coast.