Why are the Olympic Winter games held every 4 years instead of every year?

First, in keeping with the tradition of the Olympics, they are to be held every four years. The term Olympiad is based off of ancient Greek meaning every 4 or 4th year. Second, costs. It takes 20-30 billion dollars to go from initiating the bid for the Games until time to close up shop after the Games are held. Third, time. From the time for a city to state its interest in hosting the Games until the Closing Ceremony, it is roughly 10 years.