I am very confuse about what they call the gambling a game >.< its about spending money on nothing then why is it called a game? why don't call it money investment? kindly explain please? Thank you 
Games are fun and they want you to have fun. Casinos want you to feel gambling is fun and games. So that you "play" more but really just fuel their profits. So they make it feel as much of a game as they can.