They offered up their F1 (this years) twice during the draft last year apparently. Once to the Crows for Curtin and the other time to Bombers or Cats (can't remember) for Caddy.No chance, they’re not that silly.
Even the most optimistic fan / executive is aware of where they are going to be for a few more seasons.
I suspect the option is there most years, but like us, the recruiters get giddy about this years players and don't have the patience.