I think a legacy has the potential to be a better member (as long as their relatives were good members). They have a family connection with the organization that will last longer than their time with the chapter. This will theoretically in turn make both the legacy and the person that is their connection closer to the chapter and the organization.
I'm sure there are financial considerations as well.
Personally I'm in favor of it. Being a chapter founder I'd be pissed if my son didn't make the cut
