For a luxury Montauk rental, it sounds too good to be true. Six bedrooms, 7,300 square feet, ocean view, heated saltwater pool with waterfall edge, and top-of-the-line kitchen appliances listed for $2,500 a night on Airbnb. The catch, says the homeowner: It's a scam offered by "hosts" who've used the legitimate real estate photos to dupe unsuspecting vacationers.