I don't think that is the case any more, that was the point moguler6 was making. These events started as individual mountain events, but they are now part of an east coast swing of a national freeskiing competition brand. From what I've read these past two years, these events frequently sell out before the day of the event and doing walk up is not feasible for many of these events.
I maybe wouldn't go as far as national brand, but it's definitely gone beyond local mountain. Last week at Mad River you had the UVM, Smuggs, Jay, Mad River, Sugarbush, Magic, and other actual freeskiing teams there. Plus a bunch of skiers from mountains in Quebec, Maine, Whiteface, and even a group from St.Lawrence University. When people drive 4+ hours for this, it's bigger than local mountain. There's also cash prizes and previous winners are now on the Freeskiing World Tour. It's grown in the last 2 years for sure.