Marriage of attraction is a gamble anyway so you might as well marry into a family that is similar to your own and make that much less of an adjustment. But the 'love marriage' as it is called is equally common in India now. But it would be interesting to do a comparison of what would work better. Marriage is hard work and it is a gamble.
We can trust our doctors to be professional to minister equally to their patients without regard to their political or religious beliefs. But we can no longer trust our professors to do the same.