Nabil Erian, a former Marine and government counterintelligence officer now an executive at the security firm CTC International Group in West Palm Beach, said guarding Mar-a-Lago is a “nightmare.” That’s because unlike previous presidential vacation homes like Ronald Reagan’s and George W. Bush’s ranches or George H.W. Bush’s seaside vacation home in Maine, Mar-a-Lago is open to members who pay dues and an initiation fee. They expect access to the facility and want to host their equally affluent guests — and they are used to getting their way. Members pay $14,000 a year plus a $200,000 initiation fee.