I think this is why some people plant in bigger containers or plant just a few in a container which allows for growth and spread. Me, I do the instant gratification route and plant containers full. Then I just pull the chicks out for other projects or planters. Extra semps can go into my semp bed or into my acclimation flats and lastly, extra semps can be used for bribes, gifted or traded away.
My semp bed:
