Moose Jaw, both as a city and as a major junior hockey franchise, has nowhere near the drawing power of the franchises you mentioned. New facilities aren't the be all, end all. The Warriors just do not have the established links with NHL clubs, access to professional training staff and specialized coaching, or the track record in developing ex-NCAA players for the NHL, that Calgary, Vancouver, etc do.
Beyond the big market clubs, it seems Medicine Hat is starting to carve out a name for itself as a destination for NCAA defectors (Pitlick, and now Koules) but I'd argue that they have been a more stable, more successful club over the past decade than the Warriors have. It seems that they have started branching out from drafting and developing talent through the bantam draft to now supplementing it through the NCAA-defector route. Good on them.
The Warriors need to crawl before they can walk - prove to the hockey world (read: parents, players, and agents) that they can ice a competitive team year in and year out before thinking they'll start to snag big name players on their way to the NHL.