One reason is to keep the property and resources within the family.
Secondly, dating culture is not that common in Pakistan. Mostly arranged marriages are the norm so people try to marry their children in families they know well enough, and who better do you know than your very own extended family. This indirectly links with the joint family system which is quite common in Pakistan.
Although thankfully the trends are changing, people are reluctant to marry into their extended family now owing to genetic defects.
Cousin marriages, including those between first cousins, are permitted by Islamic law and scriptures and were practiced by Muhammad himself as well as his companions. Muhammad’s practice of cousin marriage, in addition to cementing the legality of the practice, renders the practice a sunnah, or a good deed worthy of commendation,
[source](https://wikiislam.net/wiki/Cousin_Marriage_in_Islamic_Law)
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