I'm in WvW 90% of the time, it's about the only redeeming quality to GW2 for me...even with all of its flaws. I don't love the game, I just like hanging out with my guild in WvW, the regular PvE content(aside from aesthetics) and the story especially are terrible. Why would I care about new PvE maps if I'm never there in the first place.
Also, I'm willing to forgo the new Desert Borderlands map for now...perhaps in the future ANet may make that something that can be singularly purchased. If not, I'll wait a year until the price for HoT is $10.
The single largest reason for most guilds is group PvP, and in GW2 that includes WvW. Why the hell ANet would make guild halls explicitly tied to PvE content is beyond reason.