It is a good idea, but the realization is not.
It took me ages to open any page.
Also, entering the data directly is not a good an idea.
It is better to use EA web app to track the prices each day\hour.
You can simulate a request in a back-end and grab the data for all the players with their min\max and calculate the mid. price. Exactly, like futbin\futhead does.
Anyway, I would like to take part in such project as a developer
If you need help, ofc.