Earlier quoted context omitted.
Calling airline vouchers 'worthless to most people' is pretty stupid. The vast majority of the population would love to travel more and is constrained mainly by their budget. The proof of this is how Delta never seems to have problems and they constantly offer Delta dollars.
Most of the US population doesn't get very much vacation time from their employer. The problem isn't the cost of airfare (which is a tiny portion of the cost of any vacation compared to hotel, meals, rental car, etc.), the problem is a lack of time.
Flying out a Friday night and returning Sunday is the most expensive component of a weekend trip like that.