Energy Surplus Provides Too Little

I can agree with allying 4. If you are only getting allying from gens, then that means you have 4 in play already (unless I'm mixed up and the spell counts as 1 allying) and the extra card draw helps keep the spell from being a drawback as cited in examples before.
If you've gotten to allying 4 via monsters or monsters/gens, then you've already invested mana for things that can be killed and are in need of gens before your allying creatures are dead.