Figuring out how much a home is worth in a vacation destination is often an uphill battle.

Whereas normal property markets have prices that are tied closely to square footage, size of a lot, quality of a building, and its proximity to basic services, many of those calculations go out the window when it comes to a market comprised of second homes. “Nobody needs anything out here,” says Chris Foglia, a broker at the Hamptons-based Daniel Gale Sotheby’s International Realty. “They all want.”