Whatever reason you have for keeping them is not as good as the reasons for clearing them. The same players are on the waiver wire. If you don't want someone else to have the players, let them. They can already get equivalent ones. If you switch in bench hitters on certain days, don't bother.
Good hitters hit good pitchers.
These reasons will only bring your team down. These spots are for starting pitchers like David Cone , Randy Johnson , and Pedro Martinez . Each team has nine active pitcher slots and three bench slots. If you remove all hitters from your bench, you can rotate 12 pitchers. Try using six starters and put three on the bench and three in the active slots.