Probably mainly depends on what the "big craft" is. Back when alot of people levelled Leather/BC super-commonly, people usedto farm Shakrami for Scorp Claws/Shells alot, and since two Air Elementals pop in the basement (and tend to have time to even repop before the weather poofs), there was potential to get 4-12 Wind Clusters each time Wind weather showed up....could do same with Earth Crystals but they're somewhat worthless XD
Point is...areas such as that are no longer camped virtually 24/7, and even if it's only something as minor as that, thats 4-12 clusters per weather pop. And weather changes aren't exactly rare in Shakrami. Jeuno AH probably loses a good 30 clusters per day just because people aren't farming there 24/7 anymore, which has driven the prices up to sometimes 5k, whereas in the past it never, ever broke 3k (and at some points dropped as low as 1.5k)
I personally had the idea to get smithing to 14ish then goto Outer Horutoto and make Rusty Daggers into Daggers for skilling Smithing (needs Light Crystal), then Dagger into Spark Dagger for goldsmithing, then NPCing em at a pretty good profit...someone might have gotten an idea similar to that and may just be stockpiling crystals, as opposed to there just being a lack of Lights. Or something..