User blog comment:GodzillaMaster/Final Thoughts on the Citadel DLC/@comment-1786741-20130306181557/@comment-3228423-20130306182337

Well it makes sense in case you need a new arm arm or an organ transplant and what better way than to make a clone specifically for that reason? Shepard apparently is an only child and (unless you're a Spacer) an orphan so there's no immediate family to be a donor. And its not like you can just find a random bloke on the street to do it because of differing blood types or organ rejection or crap like that.