I don't agree with your comment about it being about money. Other than possible sponsorship money and DA merchandise, I don't see how they are making much money. The only fee the collect from the clubs is a $50 fee per player and coach for registration fees. There is a performance bond a club needs to post to be in the DA but is relatively small and refundable. They provide all event fees (no tournament/showcase fees to attend) and all referee fees for all league and showcase games. At showcases their are multiple medical stations, ice baths, free water, Powerade, fruit and snacks not only for players but for spectators too. The DA merchandise they sell is no different than what is sold at Surf Cup or the Players Showcase. They have scouts at every field and film every game.
In my opinion, US Soccer is losing money by running the USSDA.
Now the argument to make is whether the clubs are making much money by having DA. My assessment here is that appears to be more a break even operation.