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I can't think of a reason why the devs would want to "avoid" having level 50's generate extra prestige.  It sounds like a perfect reward for maxing out your character, to me. 
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Why would you want anything other than level 50's in your SG then? 
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My answer to that is for the friendship and fun they bring to the SG. However not all SGs are like that sadly so I guess 50's still have to have a small amount of prestige.