more_2 has noticed what we all noticed, if these are “orthodox jewish men”, there are halachot about praying outside when a building is available. Not to mention it is “uncommon” to go on vacation for the high holidays, rent a house on the ocean front (and clean it up: when?) especially for someone that ordinarily lives in NY/NJ, have children play on the beach on yom tov, etc etc. But they must consider themselves very holy, if they have no need of a minyan for Rosh Hashana, perhaps they feel they were sealed the previous year already?
I did not want to ruin the warm fuzzy feeling, and I was taught that not everything we think needs to be said, but let it be a reminder to use a grain of salt or two, in regards to what we read. Especially on the internet.