You never know, if you tutor them well they may very well become new valued members of the community, maintainers of well known modules, people known for helping others, perl porters, ... We owe a lot to the often nameless teachers of the giants, the men and women who entranced Pasteur for Chemistry, Darvin for Biology, Newton for Physics, ... They might not make any big discovery/invention themselves, but I would not consider them of having little consequence to the community ;-)