Well, very unlikely you will pay some 30+ aged footballers (except GK) much higher value regardless of which countries they were from. But for youngsters, they are full of potential, so a tool to help the club to scout is very helpful. In the past, they are relying heavily on "scouting agents", and that's bit of an art than science with data backed.

Less about wages, more about signing on/purchase fee. The analogy doesn't really work because in the non football world employees are not bought and sold in the same way.

There is occasional talk about doing away with the system, as it goes against a lot of employee rights principles.