This is what currently happens with tickets to music and sporting events, and you end up with actual attendees spending more money than they'd otherwise have to pay, while random predatory third parties pocket the difference.
I met someone a couple years ago who admitted to me that she was essentially a professional ticket scalper, buying up tickets to shows she knew would become popular and would be able to make a profit on. She was careful to purchase in a way that was unlikely to get flagged by Ticketmaster's (and other's) systems to detect this sort of thing, and always stayed under ticket maximums and avoid shows where transferring tickets is harder to do. She was actually supporting her entire lifestyle doing this, without having another job. I found it pretty gross. I don't want to see this happening with airline tickets as well.
I can certainly understand and support some kind of monetary penalty for breaking out of a reservation, but it seems like airlines err too far on the side of making you think twice before canceling or changing your plans after the initial 24h window is up, and penalizing you heavily if you end up doing so.