Salt Licks?

Are salt licks necessary for rabbits to have?

   Salt licks are supposed to give your rabbits proper mineral balances and such but do we really need them?
   So I did a small experiment- bought a small salt lick (about 2.45 dollars for a 2 pack) and i put it in with Gus to see if he would lick it or nibble it a bit. He nibbled it a bit at first, but then he did not touch it for an entire month. I researched this more and other people had bought salt licks and their rabbits hadn't touched them
   So you really don't need to buy a salt lick for your rabbit unless your rabbit needs one and one is prescribed by your vet.
Thanks for reading yet another post :)