I have never seen them offer cash. They offer credit for future flights.
And they will only offer up the amount that it costs them to involuntarily bump people.
"Most bumped passengers who experience short delays on flights will receive compensation equal to double the one-way price of the flight they were bumped from, but airlines may limit this amount to up to $775. Passengers experiencing longer delays on flights will receive payments of four times the one-way value of the flight they were bumped from, but airlines may limit this amount to up to $1,550. Please see the tables below."
https://www.transportation.gov/individuals/aviation-consumer-protection/bumping-oversales#:~:text=Most bumped passengers who experience,amount to up to $775.
So why offer $10,000, when the law limits them to $775 for a domestic flight?