Why often friendship does culminate to love?
Love is the passionate and abiding desire on the part of two or more people to produce together conditions under which each can be, spontaneously express, his real self; to produce together an intellectual soil and an emotional climate in which each can flourish, far superior to what either could achieve alone.
When two hearts meet, share same feelings, emotions, thoughts...then love is born. We can even live without friends...but cannot even imagine to live without love, which is so divine, inseparable. In relations law of attraction says that like thoughts attract.
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So when all these are there naturally each other (in case of opposite sex) develops to affection and admiring or in other words a liking that makes \'a fine pair\'.
Moreover the friendship, particularly in the same field, each think it will help them too to understand better and to achieve something or to contribute (as they have a better understanding of others + & -) (and hence caste may not affect them much)
Financial dependency, acceptance by their families comes next
*** Amir-Kiran Rao (They were working together (but for a short period, and divorced Reena that too a love marriage)