Preseason games

Why do teams like the Warriors and Rapters get 5 preseason games instead of just 4 for the Celtics?

Besides those other teams, the L.A. Lakers also have 5 preseason games. The Celtics could use as many preseason games as any other team. Why do they get only 4?

FanPosts are fan-created content and do not necessarily reflect the opinions of CelticsBlog. Be respectful and keep it clean. Thanks.