It all goes back to comp and comp states. Even if very few apply to the MOC it is not a given for acceptance...only 1 per slate can be charged to the MOC. I recall ly for the NOVA area they had @5-10 at least that were appt. on top of the MOCs charges, b/c the cadets were comp enough to get in via the national pool. That is when it becomes difficult for the candidate. You can receive the nom and not get the appt, but get in the national pool, yet when you go up against some cadets from thousands of miles away you will no longer care how many from your area are applying since the rules of the game just changed.
Where are you from that the MOC only had 4?
It would make sense that people from Washington would want the Navy, CGA or MMA.
When you look at a state like NC, it is evenly spread all the way around because you have every branch, and the SA's tend to get military children applying at a high rate (statistically --- not saying there are more of them, just saying I know alot of military children that apply to the SA's compared to the avg kid)