Yes ive sold plenty. Ebay is a great place to do that actually.
But i typically buy bullion from a dealer because i can get roughly spot prices.
I have found gold/silver is highly liquid, but finding a dealer to give you a good price is hard...
Plus, im using bitcoin profits to buy... helps me sleep at night knowing i have physical value i can touch than having it all digital.
Might not be the best investment decision, but who knows, it just might be..