He's right you know...
Then again, I've crashed my race bike and couldn't drive my car home so there's that too.
Yeah that's always a possibility. But it sure makes it a lot easier for someone else to take your bike home along with your vehicle, trailer, etc. than if you just had the bike
Both times I crashed at the track the bikes were not rideable, so I just through it in the trailer and off I went. Thankfully I was ok both times, aside from a sprained wrist the first time.
Plus it's nice to have more space to carry all your shit. Riding to the track really limits on what you can bring with you. Aside from all the gear, I got 2 bikes, paddock stands for both, tire warmers, a 3'x4'x2' tool box, some spare parts, a chair, gas can, extension cord, fan, cooler with drinks and maybe some food, and my backpack where I put random shit like my tablet, GoPro, datalogger, and some clothes.