If you're building a business by yourself it's probably a cutesy widdle lifestyle business.
But if you're doing it with a co-founder you're shooting for the moon!!!
If you want to build an organically-growing, self-funded or lifestyle business (including, say, 37 signals' model) then going it alone is fine.
If you want to take on high-stakes, high-pressure VC funding and shoot for the moon then get a co-founder.
This is not logically equivalent to your statements.
At least I'm sure I don't want to be one of the stormtroopers.
If you're building a business by yourself it's probably a cutesy widdle lifestyle business.
But if you're doing it with a co-founder you're shooting for the moon!!!