Find a better grading scale for colleges, an 89 shouldn't count the same as an 80. The 4.0 grading scale is terrible.

I am a college student...this semester I have 3 classes that are above and 85 but will only lower my gpa to a 3.0. I don't understand why an 89 counts the same as an 80 that hurts people trying to go to grad school and also there is no reward for people wanting to make 100's. It's like if I know I have an A in a class I don't care to try hard anymore because there is no benefit. The bottom line is the 4.0 scale is outdated and over rated.