I saw $300 and confirmed seat on a flight three hours later, DFW-SMF, Monday. I did not jump at that one.

I'd say a $300 voucher sounds typical. An overnight, I'd be trolling for more or at least $300 + hotel and meal vouchers, assuming I chose to be in the game.

Best I've seen was $1,000 vouchers and confirmed J seat the next day for a flight to NRT. The response was classically Pavlovian, and very speedy indeed.