I know someone who wanted to put up something worth investing in on GLBSE...I've never looked into it closely. (I believe they are still in the process of doing so.) Could you briefly touch on the obvious reasons?
Legal and taxation.
Any company (and no I don't mean someone calling a bunch of rigs a mining "company") only exists because the state says it does. So Tangible Cryptography LLC is only a legal distinct entity from its owners because the Commonwealth of Virginia says that it is. Doing things contrary to the Articles of Organization and the laws of Virginia governing Limited Liability Companies jeapordizes that standing. There are rules on LLC and S-Corp which limit who can be an owner and the process that ownership is established. For example in an LLC an owner (member) can't simply sell ownership to an outsider. It requires a vote of existing members to include the new investors as a member and then a transfer of ownership between existing members. An S-Corp in the US can't have foreigners as shareholders. Neither entity can legally offer public securities or solicit investment (other than to qualified investors).
The taxation is even more of an issue. The "entity" (LLC, corp, partnership, etc) is legally obligated to report the profits of its owners.
How do you do that when you don't even know who owns your company?There are other legal issues but those two are a deal killer. So either you don't form a corporation or other legal entity and simply put a bunch of assets in a "company" online or you willfully break the law and likely suffer massive consequences when the law catches up to you.
For many entities which deal in the "fiat world". Non-compliance with the law and taxation is simply impossible. Tangible Cryptography LLC cashflow (not profits but cashflow) is on the order of ~$10M for this year. If we continue to grow it could be closer to ~$15M. Do you think the IRS hasn't already been notified by our banks.
We are almost guaranteed to be audited the second our company files its tax return. Our books have to be air tight. Having quasi-illegal owners on some unregulated anonymous exchange is pretty much a guarantee the LLC would be dissolved as fraudulent and the known owners charged with tax evasion and other crimes.
There's a couple of things that may add to the discussion:
Small businesses can, and often do, choose not to formally organize. This is not illegal. There are plenty of mom and pop sole proprietorships/DBAs, and general partnerships out there still. The downside of choosing to do business this way is, of course, you don't have limited liability. The upside is you avoid registration fees and franchise and excise taxes. Since they're not making much money, often don't have much to lose, and operate the business themselves, they assume the risk. SPs and GPs don't require much paperwork. If you're engaged in some sort of business, and you haven't registered it, you're a SP or a GP by default.
Here's where it gets interesting: The SEC has a number of exceptions for small businesses. You can issue up to $1Million/year if you live in one of the covered states, and you only have to notify the SEC of your issue. My state has special rules for organizations that don't have limited liability. As long as you notify the regulatory bodies at both levels, with details of your issues and how much you raised, you're in compliance, or at least you have a good case.
Finally, I don't know as much about this because I haven't studied it too closely, but there was legislation passed just this year that made an exception for funds raised through crowd funding websites. Exactly when you can and can't use this exception is clear as mud, however, because it hasn't been tested in court yet. I have to admit, though, that I tried to discuss this with GLBSE to see if they had looked into compliance under this exception, and they had no clue what I was talking about.
I would hope that anyone planning to issue securities would have looked into the regulations that applied to their specific case. You'd be surprised at the list of exceptions (it's a long as your arm).