I know one Indian boy, who was selected by a club to play football , if u have extra ordinary talent, sure..you will be selected. preference always for nationals, that's quite natural.
Here expatriate schools are not giving admissions to all their nationals, bcz they can't accommodate all, it depends on the availability of seats. the same way the clubs can't accommodate all who wish to play... so they will select extra ordinary talented people even though they are expatriates. so don't blame....