Yes, draft picks can be swapped, and were swapped this year.
Not surprised by the offer... Sydney made a similar request to Richmond for pick 3. Thing with this draft is, if you don't have a top 4 or 5 pick, your chance of picking up an elite player is slim... on the flipside if you do have a top 4 or 5 pick you are more guaranteed than any other draft in history to recruit an elite player. That's how the clubs see this draft... extremely strong early on (1-5), good to average after that (6-15), and the rest is a lucky dip. We've certainly hit the jackpot this year with our picks... I don't think people realise just how good picks 1 and 2 are this year compared with previous years.