The airline doesn't like it because it enables ticket arbitraging. (That's the reason they're fixed to your name) Also for tracking (err security.. but that's not really their fault)
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.