That is because the decision to host them is made because for other countries they have served as an incentive and accelerator for tourism and therefore have helped to spur economic activity rather than our being able to truly estimate their impact on the national or regional economy.
La decisión de organizar estos eventos se toma más porque a otros países les funciona como incentivo y acelerador del turismo por ende como un dinamizador de la actividad económica que porque realmente estimemos su impacto sobre la economía nacional o regional.