Alta may be much like Mad River Glen. A sort of a museum. They haven't gone the whole high speed quad route or any of that, so they are not in need of $$$. My theory is that when the old man who owns Alta now dies, the kids will get greedy, and we'll be in! ;) (ha ha)
As far as Deer Valley, Their instructors visit The Canyons, where I teach, whenever they get a client who wants to snowboard. I spoke with one of thier instructors about this on a lift just last week. His comment was: They are pretty much running at capacity now with skiers only, why change things? They've got their market of foo-foo skiers filling their bank account, and it's a market niche.
As far as groomers are concerned, everyone claims that Deer Valley has no equal... So until we live in a perfect world, we'll just have to ride Skwals at Deer Valley and carry poles just to keep up the image... "Is that a snowboard sir? No, its an in-line monoski!" (right Billy?)