Thats such a lame argument diwana, why would one fake a domicile of karachi when apparently karachites have less qouta than other. A person from other areas will find it easier to get jpb or admission on the qouta of his native area which according to your claim is more than for karachi.
Bhaijaan, cruel joke was played on rural sindhis, when government build no instituition in interior sindh or university in interior sindh, but only concentrated in Karachi and Hyderabad. On top of that a language which they did not know (urdu) was imposed on them and where they could not compete with urdu speakers in jobs and admission bcoz they didnt knew the language as well as them.