I guess I'm into mischieviousness. We also aren't supposed to wear or display other resorts logos.
I have one that says: ASPEN SNOWMASS SKI & SNOWBOARD RENTALS (heck, it's always covered with snow anyway). I did it more as a joke and to see if my co-workers would notice.
I wasn't the one to show up a lineup wearing a shirt with VAIL printed on both sleeves.