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I've "generated" $16 for the organization my Smile profile is aimed at. 

How much did you spend to generate that $16?
So by "impact" they mean the impact on their bottom line, yes? I mean, any amount given to charity is better than nothing, no? >

You would think so. I've "generated" $16 for the organization my Smile profile is aimed at. Total they've received \~$550 from AmazonSmile.  
It's not a lot, but it's $550 that they didn't have before.