because a certain group of progressive kammas, prominent among them being tripuraneni ramaswamy, in the early part of the last century, had started a rationalist protest movement, a rebelllion against brahminism, ritual and caste. forget the rationalist...rebellion... part, what remains of the movement now are vague theories about how the kammas are connected with the kayasths and jats and other equally interesting formulations. why was it important for the kammas to claim kinship with those north indian communities? because it'd place them on a higher notch in the varna hierarchy- the kayasths, depending on the region, claim a kshatriya or brahmin status.
the practice, among some kammas, of appending the title chowdhury to their names started around that interesting period in recent history. not all kammas like to embellish their names with that armour- only those who believe strongly, i guess, that the kammas have been wrongly thrust with the lowly status of shudrahood.
renuka chowdhury is probably the only politician to have spoken out, admirably and consistently, against the sri ram sene goons and in support of young women's right to choose how and where they spend their free time. but i still can't see why she chooses to be a chowdhury- the rationale behind the adoption of the title chowdhury, roughly, is an endorsement of the worldview the sri ram sene advocates: every man and woman should be aware of his/her place in the hindu social order.