I'm under the impression that most people do that.I know many will cringe and would die to do this, but if you are starting out and need some dust I'd check for gold dupes.
Unless you are really hung up on having golden cards you can dust the golds of cards you have 2 regulars off.
That could get you on your way to crafting a legendary that you might use all the time in your favorite class or 400 can craft some good epics like MC and Pyro Blast as well.
I prefer a bunch of golden cards over a legendary or two.