Never feel sorry for anybody. Some guy loses his star player. Either the guy you trade him turns out to be a slug and the other owner swears that you intentionally ripped him off, or the guy turns into a star and the other owner will insist it was his vast intelligence that made the trade a winner. Either way, you're a bum. Pitchers will break your bleeping heart.
Middle relief is the most underrated commodity.
Their innings make or break your season. There are really no great catchers anymore. A perfect example is former Cub Hector Villanueva. My kid is a Cubs fan. I tried to warn her that she was looking forward to a lifetime of pain and despair, but she became a Cubbie fan nonetheless.