you need to remember, for crystalline to be in demand, it needs to be useful. If there's no demand/use peopel won't want to use it. There's only a very small number of people who will use most of the crystalline sets which are more pvp orientated than anything else. Takeos/Volkers are in demand because they are useful for what the bulk of the players do. Hunt.
p.s. crystalline is a tough one. My suggestion would be give it the lowest weighting possible and even swap it out every couple of weeks with crystalline from the last batch. *shrugs*
For crystalline not to stall we need UB200 removed from the game again. As it is I have my Takeos set and will never need to buy a new one for me, or my guild.
Should crystalline take damage in the arena, this could also keep it flowing.
some more clover to chew on.
Takeos is in demand right now because it is useful, I agree - and the others much less so. However, eventually everyone who wants a Takeos set will have one, especially with guild tagging. Unless durability is lost somewhere - I don't care where - then those arenas stall too. The effect is delayed a bit because more people level up than play 600+ arenas, but not by too long.
I do think the arena should cause durability loss - I mean you are still hitting things with the weapons!

