Rust Economy: Sell sulfur (to server) for currency

Sell sulfur (to server) for currency with button/command. Why? An alternative use for sulfur => potentially less raiding or snowballing from raiding bases. I know you could use GUI shop, but I think it's a bit overkill for this purpose.

Also, would it be possible to make an auction house plugin (a UI sort of similar to the auction house in WoW) for Rust? Where users can sell anything, set their own price. Could skin be displayed for their listed items?