Snowboarding? PSSSHHHT it's a fad.
To be fair, Mount Washington was one of the first places to allow boarders (shortly after FP, which was really early to the game).
Mount Washington is just too far away from most people to make it worth driving. Sure there's going to be the hardcores, but to grow the sport they'd need Victorians to come up and try it out. 3-4 hours each way to go to an area with little else to do is a hard sell.
It is a great park, but not great enough to draw people from the mainland in any relevant numbers. I myself went over at least one weekend a year, but only because I was there visiting family. I don't think that any amount of clever management could make that place do much better than break even.
What would probably work out is that old ski mountain that's on the way to Port Alberni. The finances of getting the lift up and running are probably prohibitive, but something closer to the masses would be more likely to succeed, and the Island deserves lift accessed trails.