Unless your an environmentalist pissed about the wasted electricity or whatever, then I can't really see what the issue is.
I would guess that blue has their reason for it. Trust me, I've worked at resorts. Ski areas are cheap. All of them. Thus I really believe that blue isn't frivolously pissing money away then saying "oh well, we'll just pass it on to our customers". There's probably a method to their madness. Like Toast said, why not ask them.
Blue is in a prominent location and shows well (like a legit mountain). By prominent, I mean it can be seen from lots of places. Have you ever driven down maury road or 534 or 209 at 2am and seen it all lit up miles away? It gives me a ski boner every time. It just looks cool and I always point it out to whoever I'm with. Maybe it's their way of advertising. Yep here we are. We're bad ass looking compared to big boulder or jack frost. Come spend $ here. I personally think it's cool.