Because the fact of the matter is that experience in dungeoneering really doesn't matter. Tokens are the big deal and the experience is irrelevant. Clans would have to actually inventory check people to make sure they have the items that they're after, and then they'd have to keep checking over and over to make sure that they haven't lost their weapon since then.
If people are going to start having issues with Dungeoneering brought into the warring scheme, why not make having a certain dungeoneering level a requirement to join a clan, just like having a certain combat level or magic level requirement. Don't know about how much this would contribute to this topic, but that's just my thoughts after seeing some of the arguments here. That way, clans that like dg items on can just war each other while both have fairly decent access to these new items and what not while not causing too much fuss.
It's not like you actually get the rewards if you level up, or if tokens were common.
Wow, ever thought of a screenshot in the application process? It's a wonderful thing isn't it? Besides, the don't disappear when fully used, they just become unuseable.. not to mention to recharge it's only a small fee of cash or mixture of cash and tokens and whatnot.. I'm sure this will be done within a year or so when dg becomes more commonplace.