Middle relievers, by definition, only come into drab, hopeless games. There is no pressure, because the starter has already screwed up. Another job in sports I would like would be a manager of a wrestler. Yes, occasionally, you have to get involved in a scripted melee and get hit on the head by a breakaway chair, but mostly you just get to wear interesting clothes, and have a funny name and a good story line. Lots of times, too, wrestling managers are right there when the women wrestlers tear each others' clothes off.
Wrestling manager is one of the best jobs in sport.
Another good job is conference commissioner. Talk about a boondoggle. The NCAA makes all the rules, and the athletic directors make all the schedules. I think what conference commissioners do is order the trophies for the tournaments. Still, the best job of all in sports is back-up quarterback.