Labeling him as a chief treasurer for signing the checkpoints strikes me as seriously odd. He's nothing more than a rubber stamp for the blockchain here.
EDIT: Also, all the accounting happens in public, so it's auditable by anyone wishing to do so.
Two non-sequiturs in one post? I'm not sure if you are naturally myopic or willfully myopic.
1) Recall the BIP wars from around April. If you call that rubber stamp then I'll call it rubber-stamp bazooka.
2) Blockchain works as a ledger only if the address ownership is published. I recall only one case where Mt.Gox published one of their addresses after the hack to prove the control of funds. Nothing like that happened ever since despite the added RPC call functionality that was designed for just that purpose.
1) BIP
Wars? There was a lot of noise, I can agree with that. But that's all it was. Blown completely out of proportion. The whole thing is comparable to first deciding to paint the bikeshed and then having a long and noisy argument about which color to paint it. Only, in this case the whole community needed to agree on the color for the painting to happen at all so it became quite a messy affair after another color was proposed. Almost everyone agreed that the new functionality should be added. The argument was about semantics of exactly how to accomplish it.
The checkpoints are very different. Choosing a checkpoint that isn't already a part of the current longest chain is something that will fork the chain. Even then, the fork will only happen if a significant portion of the mining power also chooses to adopt the checkpoint. The users have the choice of which fork to use. Gavin can prepare the fork but it'll only matter if enough users decide to use it. This is why I call him a rubber stamp here.
2) Everyone can verify that the network rules have been followed, the accounts are public afterall, even if not easily linkable to their owners. I take it you are saying that's not enough to qualify as an audit?
To sum up. Gavin is nothing even close to chief treasurer of Bitcoin. Such a person does not exist. That's what's so revolutionary about Bitcoin. It's a distributed consensus system. For something to happen in this system, a consensus is needed.
I don't expect this to remove the problem of not fitting in with the stock exchange rules though. I'd be really surprised if those are applicable at all to a system without someone responsible for accounting. So, in that respect, I do understand why you'd want someone to be the chief treasurer.
(I should probably disclose that I have no knowledge of the rules the stock exchanges use. So, unless you or someone else fill me in, I'll be completely clueless about them.)