Nothing stops an exchange from doing this, but such an act will trash its reputation and therefore reduce its profit potential. This mechanic is sufficient to eventually bring the probability of such an event down to a level that customers are happy with on balance.
Nope. Now that other exchange owners notice that Mark Karpeles is getting away with his massive theft, they'll have every incentive to replicate that theft. And they'll do so. Repeatedly. And they'll use the same type of lame excuse as Karpeles and his defenders have used, i.e. that hackers and/or the US Gov. stole all the BTC and the fiat. And that they're under a gag order, etc.
If the owners of an exchange are being trusted with more wealth than their reputation is worth then they likely will. The idea of feigning a hack or bug and running with the money is not new.
I agree that this can happen repeatedly, but argue that the frequency of such events will decrease as people become wary of trusting large amounts of money to highly indebted entities with little reputation.
Nothing stops an exchange from doing this, but such an act will trash its reputation and therefore reduce its profit potential. This mechanic is sufficient to eventually bring the probability of such an event down to a level that customers are happy with on balance.
This mechanic is also useful in lowering the barrier to entry for competing exchanges.
Reputation? If they take a couple hundred million over 2 yrs, they won't give a F about reputation.
Yes. This highlights what can happen when people trust more money to an entity than its reputation is worth.
On the flip side of the coin, imagine I trust Gavin Andresen to hold 0.01 BTC for a week. He certainly has an incentive to steal that money; He'd be destroying his reputation, but would be up 0.01 BTC! I hope you can appreciate that this is not in Gavin's best interest; his reputation is worth much more than 0.01 BTC.
Nevertheless, that is NOT the issue, the issue is that they can take it if they want to, that ability must be "balanced" with 'checks and balance', certifications, guarantees, audits, financial security, electronic security, protocol security, transparency, and accountability so as to minimize the possibility of that happening.
You're simply asserting that regulations are the only thing that can "minimize the possibility of this happening". I'm describing a regulation-free mechanism that I claim would have precisely this effect.
There is no market "barrier" for integrity, accountability, transparency, and financial security - if you are only worth 2 btc, then only say you are worth 2btc, only show 2btc, and secure that 2btc with all of your might; allow the blockchain to show your name for incoming/outgoing funds this make it easier for everyone to track your performance, and to trace things.
Certainly, these tactics all boost a newcomers trustworthiness (at the expense of extra work). I have no problem with an exchange experimenting with such things. If people eventually tire of having their money stolen, then doubtless such exchanges will have an advantage. If not, exchanges designed to steal people's money will continue to dominate.