Draft day is mentally exhausting. Intellect is taxed among listening for bids, keeping books, and maintaining discipline. Think entrance exam with an occasional round of drinks. Afterwards, armadillo eggs get served and mugs are raised in congratulations. Best of luck, but no too much luck.
Leagues succeed in highly transient environments, such as colleges and workplaces.
One reason is that the Internet continues to revolutionize the game. Innovations have always imbued the game, in part because of demand created by the fantasy baseball industry itself. The USA Today published expanded box scores, with in-season batting averages and ERAs. Owners no longer had to wait until the Sunday paper for these statistics. The yellow boxes of The National sports daily became daily stops and quarter-eaters on the way to work.