My vote is money grab. Plus, that was filmed sometime after 2014, since that is when the "possession" of the family occurred. I've been paying attention to older episodes when they rerun, and I swear Zak was wearing those stupid glasses well before 2014, just not all the time.
Someone at Travel Channel needs to put their damn foot down, and insist he get some therapy for his fear of flying, and start going to locations east of the Rockies. I think it was somewhere on Reddit that someone thought he was being such a turd about travel to "punish" Discovery Inc (the parent company of both Travel Channel and Destination America) for airing Nick's shows. Now that they've been cancelled, maybe he'll be willing to start actually going places again. Doesn't make much sense, but it makes Travel Channel look bad to air a show that used to travel, and now refuses to go anywhere except Nevada.