...
Newbie Auctions are only available to farms younger than 90 days (From first parcel purchase) AND/OR under 100 land tokens total (realism ironman or standard)
Regular Auctions are open to farms of any size, playing on standard servers.
Realism Ironman Auctions are open to farms of any size, playing on realism Ironman servers.
Brokerage Auctions are open only to players owning Land Brokerages.
Land tokens are non-exchangeable or sellable. You can only use them to redeem land.
...