Boss kill loot multiplier and respawns (feedback/idea)

feedback/idea: what about a boss respawn timer in game combined with a loot multiplier for each boss killed. Encouraging players to fight different bosses in one play session instead of just quit farming. Thoughts?

For example: bosses take 10 min to respawn and each one you kill doubles your luck (to a cap?). If you quit, you lose your multiplier.