How do you suggest they do this? Hire 30 full time people to work on only rosters? That'll cost roughly $1 million a year, at least, and that's at a low per-year salary. No chance they do that.
30 part time people? One per team? That'll lead to bias and/or extremely high/low ratings because most people either overrate their teams players abilities or underrate them considerably.
If you have another idea, I'd love to hear it. Especially since you seem to think it'll be an easy fix.