[RangerDanger]

Here's the problem with growing more than one plant per container (from seed).
Let's say you have 2 plants growing in the same container. After 12/12-ing you notice one of them is a male. It's gotta go.
If you rip it up, you're gonna screw up the other plant because likely their roots are intertwined. If you rip the male up you7're also gonna take some of the roots of the other plant, or at least disturb htem.
Maybe you figure you'll cut the plant off at soil level.
That means the roots of that plant will begin to rot. Intertwined with the other plants' roots may give the remaining plant root rot.
I can't think of 1 advantage having more than 1 plant per container can provide.