> So why are you using an RDBMS?

Because even a shitty RDMBS is more robust, more secure and faster than any NoSQL wankery for this kind of use case.

How many times do we see the opposite question getting asked?

Postgres is robust, feature-filled, and scalable. You dont have to want all three to extract value from it.

Postgresql has gradually and intelligently been incorporating NoSql features e.g: hstore, hstore2, json, jsonb, etc. There are powerful features like indexing, etc.

There are even cases where performance has been found to be better than e.g: mongo: source: http://obartunov.livejournal.com/175235.html

There is a lot of momentum behind the improvements/additions. We will be seeing much more NoSql in 9.4, 9.5, and beyond.