word of mouth is a marketing strategy
double palmface*
People can say concrete things about the game. They can relate it to past iterations of the game and they can pass on excitement. Excitement breeds excitement.
look up word of mouth marketing and hype......here I'll save you a step
"Word-of-mouth marketing, which encompasses a variety of subcategories, including buzz, blog, viral, grassroots, cause influencers and social media marketing, as well as ambassador programs, work with consumer-generated media and more, can be highly valued by product marketers" -wikipedia









