So signing a contract with an Electronic Demon still carries a certain level of danger, it's not as simple as encountering one in the bushes and throwing a Master Ball at it.
Moreover, in principle, a person can only command one Electronic Demon, so once you've entered into a contract, trying to make another contract with other Electronic Demons is basically impossible. As a result, it really depends on luck; if the first Electronic Demon you summoned was a powerful one, then you're naturally on easy street.
But if you summon a weakling—well, in most cases, you're bound to that weakling for life.
Of course, even the weakest Electronic Demon is stronger than humans.
