I've had the family account thing Microsoft recently retired so I use 4 gold accounts. Not sure if silver works.
I'm late to the farm account game though. I just realized it was a good idea to use them when the cover vote guys were released. I should have been using those accounts to open packs rather than fill up my main reserves. I've quick sold hundreds of cards as a result.
Now I've got 80 auctions running and 4 shots at cover vote players a week. Too late to brag though with this mode floundering.