Lots of comments in that thread more or less saying "The drive back to LA would be the same time as the flight"...

These people have never left Vegas on a Sunday and it shows. That drive is 4 hours, without traffic. With traffic it's an easy 7, I've heard of it being as high as 13. So yeah, if you've got a jet, and the money to fly it, I'd say that you can probably justify using it here, it's like half the time.

Though, even flying commercial would save almost the same amount of time, you might pick up an extra hour, much more waiting around, but, beats being stuck in the middle of BFE in traffic.