Exactly. Be sure to double check all the paperwork the GA gives you - VDB amount correct? Meal vouchers? New boarding passes for the correct class of service? Hotel vouchers if applicable? I am very polite but very thorough when I VDB.

As was stated above, it has nothing to do with "compensation" but rather with negotiation. I have often negotiated an F seat for a new flight when I was VDB'd. One time I was told by the GA it was not available. But I was told to go to the TA outside security to complete the paperwork. Before doing that, I double checked myself about F availability and sure enough, plenty of room. I told the TA that the GA said she would have booked me into F if there was room, and it looked like there was. That nice TA indeed rebooked my new flight into F.