And you mention agents.
It's interesting that they omitted Hawi's cut... I imagine NB has to kick him at least $25K/year
Why would New Balance pay Berian's agent? By that logic they should also pay his massage person, any doctors he needs to see for running matters, and chip in some quarters when Berian buys bags of ice for an ice bath.
Berian gets his money and then can spend it how he thinks best to help him succeed. For many athletes that involves hiring an agent, who get a cut of the athlete's money, usually 15%. That's why some athletes opt to do it on their own.