Apparently, the familes actually agreed to a lower price on this one.
https://www.cbsnews.com/news/the-onion-buys-alex-jones-infowars-auction-sandy-hook-families/
“The Connecticut families agreed to forgo a portion of their recovery to increase the overall value of The Onion’s bid, enabling its success,” according to the statement.
Not always voluntary. Some tried for a third term and failed. Theo Roosevelt tried for a third term in 1912. Though his first term was taking over after McKinley was assassinated, but it was only some months in, and that would be covered as a first full term under the later amendment.