Can you explain, if Brahmins represent only 4% of the population (like a comment said), why in your example the landlord and the girls expected a Brahmins (and

Can you explain, if Brahmins represent only 4% of the population (like a comment said), why in your example the landlord and the girls expected a Brahmins (and not just "any 'respectable' caste") ? To me, it sounds very illogical : like only wanting to rent or marry millionaires...