I may be one of the last people to use their Delta price mistake ticket, but I may very well have been the winner. Long story short: I booked five tickets to LA from JFK - for some reason I only got business on the departing trip. Total ticket cost: $210. We flew to LA on business (amazing!). Got free tickets to Disney (on account of a letter I sent the last time we traveled there. They sent us free tickets for our next trip).
On our return trip, Delta overbooked. They asked for volunteers to be bumped and because there were no hotels available in the area, they offered $800
per ticket! We uber'ed back to the place we were staying for $1.78 (promotions/credits), back in the morning for our return trip for free (wife's Uber credits) and on our trip from JFK to our house for $1 (more promotions/credits). Mind you, they offered $400 and business for the return trip if we'd take a much earlier flight but we declined and flew cattle class (that's what it felt like, but was still an amazing trip back. Delta's in-flight entertainment is amazing now) for the $800. $4000 in vouchers.
Do the math - I think we came out a little ahead