When you add that to the mix i see where you're coming from then how about a sold option? say... Mog house option allows 99 clusters, but AH would offer a stack as they are normal? it shouldn't unbalance it stock prices should remain the same collection of crystal sizes seems more feasible then before.
The only issue with this is that people would most likely abuse the AH prices by overpricing due to high amounts of product (crystals) and unlimited supply storage. leading to retarded amounts for a stack of crystals you probably could just end up farming. Hmm this is a toughy...
Or you might even get the Opposite effect due to high amounts of crystals stock prices will either drop from AH and we would probably be around 1-2k a stack (could only imagine if we go back to the old days where they were 800stack-500gil *drool*) i hate economics there's usually always a case where 50/50 chance =/
I like the 99 option for mog houses it seems more helpful to have unlimited supply storage for items on crafting so it does not interfere with storage that could be spent on gear. Mules should not be a must.