Picking that secondary guy to go with your elite players will make the difference between winning and losing. There is something to be said for finding value at a price. Finding that value is a skill that is not based on luck. Skill ties more into percentages and analytics.
Webster's definition of gambling is
: to play a game in which you can win or lose money or possessions : to bet money or other valuable things
: to risk losing (an amount of money) in a game or bet