Rule in Mammoth is you lose your board you lose your pass. I've used a leash for a long time, finally ditched it. If your newer, sometimes when strapping in, you can forget to wedge your board down and it may start to slide. The last thing you want to do is take some unsuspecting person out. I saw this happen. Snowboarder's bindings broke, but his stupid ass was still trying to ride down without being strapped in, instead of hiking down or back up to the lift. He eats it and his board zooms down the hill, narrowly missed me..I yelled ahead of me, but this poor skier was taken out hard. It was the worst cause he wasn't even expecting it.
I was also taken out by a runaway board last season on the bunny slope. I see the cougar snow bunny coming down to retrieve her board and she doesn't even ask if i'm okay. I told her she needed to get a fucking leash. She had the fucking nerve to not apologize, and instead tell me "honey, i've been snowboarding longer than you've been alive." I'm 29 (but i've kept well), and usually very calm, but those are fucking fighting words to me, especially after i got hurt for her bullshit and she didn't even ask if i was alright. I told the bitch "then what the fuck are you still doing on the bunny slope with a runaway board? You look like you've got alot of miles on you, but if you want more I can run some more tracks all over your face." At this point ski patrol shows up, apparently, after her board took me out, it proceeded on down to take a couple other unsuspecting noobs out. I mean damn, noobs have it hard enough as it is staying on their feet, they don't need any help!!!
Wear the leash until you really feel confident enough to be mindful of wedging your board in, eventually it becomes second nature, but precautions are always good, it's just one little extra step you won't notice after a while, and it will help keep you and others safe.
Every turn is a blessing.