javierv14,
Do you know of someone who can manage a project with over 20,000 roms and do everything 100% perfect all the time, because they don't exist.
We use things that are sent to us or linked to us at the time. Keep in mind: this is a hobby project, we do this for fun and for free when time permits, on top of that - anyone can contribute. If you want to update a rom entry, get the code at github and make a pull request if you'd like it to be done faster.
regards,
- dink