From my perspective, if you're gonna collect monthly fees and host companies on your trusted platform, in order to maintain that trust in situations like this is to have insurance incorporated into the business payment model. Either that, or do a more thorough background checking format that ensures you don't have epic scam artists putting their bellies up to your bar.
1. I'm pretty sure that if I buy shares of AAPL on E-Trade, they're not insured if the ghost of Steve Jobs takes his turtleneck and $178Billion and skips town with it, or they do something really stupid like start selling $17k gold digital watches. I'm the one who bought Apple shares, it's my problem if they go belly up.
2. I've never tried, but I'm going to guess it will be a tough sell explaining to your insurance agent that your Panamanian shell company that specializes in exchanging unregistered securities outside the jurisdiction of any major exchange regulator wants to insure the full value of the shares traded on your platform, in the case that those Chinese registered companies, controlled by a mastermind known only by an internet forum name, decide to abscond with the anonymous virtual currency you paid them in. I could be wrong though, it might just be a checkbox on the application form.
3. If ASICMiner had failed the background check that one of these exchanges would be able to provide, there would be literally 0 Bitcoin "stock exchanges" left. ASICMiner might have screwed over everyone, but they did produce the first Bitcoin ASICs and made a crapload of money before being listed on exchanges. Compared to a most of the crap mining bonds or obvious scams like NeoBee or ActiveMining, they were
a gold standard. Then again, all of these illegal stock exchanges going belly up wouldn't necessarily be a bad thing.
Well, if anything, the whole thing is a highly interesting experiment and we - as a society - may learn from the mistakes and can build on what remains and proves to be successful.