You need to contribute at least $7k per year to Duke for season tickets (that's the upper area behind the wall).
When I was at Duke, the entire lower area in front of the wall (which surrounds the entire court), was composed of:
a) the 2 side-court areas -- undergrads only (no tickets -- first come, first serve, and free (except for that whole tuition thing)
b) end-court area to the left side of the TV cameras -- grad students. This is still the case, and there will invariably be a couple of Cuse folks there
c) end-court area to the right side of the TV cameras -- the band, plus some other Duke athletes
d) floor seats on either end -- boosters and their families
The only area for visitors was essentially a 2-person buffer perimeter between the visiting bench and the Crazies. Usually this was occupied by family and a couple of VIP's
Now, since I graduated, and everything went to with our undergrad population, an entire side court area (the side away from the TV cameras) is no longer occupied by undergrads (normal students stopped going after the dork patrol turned it into a freak show), and most of what's behind the guest bench is folks from the visiting team, whereas the folks behind Duke's bench are family, friends, and celebs.
Frankly, I'd be surprised if Duke allocated more than 20 tickets to visiting teams when I was a student.
Remember -- even the broadcasters get a seat literally on the ceiling of the building, and the press row area (it's literally just one row) is immediately in front of the undergrads on the TV side. Reporters regularly walk out of there covered in sweat and blue paint.
It's a tiny place (which didn't even have AC when I was there -- thankfully, that has been fixed).