How ruthless are you?

I've often lamented about the number of baby plants I have and the prime reason for the problem is that I can't bear to cull the stragglers.  I work on the principle that even the weedy ones deserve a chance and some investment.  That said, I'm a devil for leaving plants for too long in small pots or forgetting them until such time they're no use at all so some get culled by neglect.
So how ruthless are you with the runts and stragglers?