Room assignments cannot be transferred, traded, or otherwise re-assigned among Gen Con accounts, and room assignments connected to one Gen Con account will remain associated with the originating account until registration ends or the room assignment is cancelled.
Account holders who find themselves unable to attend the convention can modify their room assignment to designate a friend or family member as the primary guest for their room assignment. With cardholder consent, they can also put the primary guest’s credit card on file to secure the assignment and pay the hotel deposit after housing registration ends; but the account holder retains the ability to modify or cancel the room assignment at-will and remains liable for the Terms of Service and any declined credit card transactions. If a room assignment is cancelled and the credit card on file is declined for any reason, the account holder remains responsible for settlement as required to keep their account in good standing.
Putting this out here because I just got the email myself and some folks aren't set to get the notifications, and because people need to know this VERY IMPORTANT change to how things work.
tl;dr: It looks like they're heavily punishing folks who get something 'not where they want' and try to trade for something better.
Yikes.
I know, right?