It's all about whether they want to go through the craziness of making a shitload of snow in a short time. They are limited by the amount of water they can pump at a certain time and by the number of guns they have, not to mention this fucking stupid shitty weather. So if they want to put a ton of man power and money into blowing the bottom trails in the middle of the night three nights in a row, one of which being fri night (meaning all that shit has to get groomed after being blown before opening) then they will open with features and it will be most radtacular. If they don't feel as though all that effort will get them a good dollar return, they simply won't do it.
However, I think that if they put in the effort and announced an opening on thur or even fri, a shitload of people would come and they would make some bank. If not, we're all just going to go up to Killy and give them our money again...