Last winter, the Milwaukee Brewers made headlines when they traded a bevy of prospects for Marlins outfielder Christian Yelich. The promising outfielder was coming off a great season, but had not quite unlocked his considerable offensive potential. They also added free agent Lorenzo Cain, paying a premium when few others were spending serious (if any) money. The Brewers went on to win 102 games — 96 in the regular season and six more in the playoffs, just five shy of a title — proving to the baseball world that yes, it’s generally a good idea to try to make your team better.