A neighbor of mine was in a car accident and broke her arm. She got a lot of money. I was also in a car accident and broke my nose. Why isn't my case worth as much as hers?
Each case is different. Each injury affects a person differently. Even if you both broke the same bone, your pain tolerance might be different. You might need surgery to correct the problem, whereas your neighbor didn't. She might have been a world-class pianist, and her broken bone means she lost months from work. Your situation is probably different.
It's important to know how your injury has affected your daily life. Has it impaired your ability to do your daily tasks like tying your shoelaces, taking a shower, making breakfast, going to the bathroom, holding groceries and similar activities.
Since everyone is different, and their injuries affect each person differently, the value for each case is different.