By Christina Alissandraki, Partner ExclsuivelySpa   While Christmas and End of Year celebrations are known for creating a shopping spree, turnover in the spas often increases just marginally.  We often take for granted that guests will visit the spa, at least once, for that last minute glow treatment and rarely take an effort to create a buzz that will result in substantial retail sales increase and repeat visits. Winter resorts’ spas rely on increased penetration of hotel guests but that is true up to a point. In ski resorts, for instance, guests will leave early morning and often return exhausted at late afternoon just in time to change for dinner. At the same time, in city spas, people rush after work to buy gifts and…