Your army of minions turns on you, or starts slaughtering people in the streets. The walls start to bleed, or a rupture in the space-time continuum creates a doorway through which hordes of demons start pouring into the lab. A good dental plan and retirement package. Threat of death or grotesque experimentation. Hypnosis Electronic implants.
Rivalry is for children.
I have no insecurities. Whoever has more money or politcal power. The secret goverment agencies. The mad scientist in the next castle over. Various electronic gizmos, such as calculators, computers, laser pointers, and virtual pets like Tamagotchi and Furby.