I don't think it is actually exactly a 15 point negative quality in life modules. The reason being that you can move through and take other modules with that as a negative quality and it'll not change or increase, so it can't be balanced as a 15 point negative in each module. So if you have 3 modules with Corporate Limited SIN, you still only have it as one negative quality, and you don't have to pick another as you would for other duplicates.
I do think the life modules need a balance pass, though.