Don't know if this has been answered before, but my main concern are the legal problems that other US-based companies who have listed BTC-based securities have had to face. I like the plan and the market, but I'm a bit worried that one day the SEC will slap down on the company for issueing unregistered securities.
We're in the process of meeting US's SEC requirements with our company which is a hong kong based LTD. We're in the final stages of PPM formation and hopefully will have something out relatively soon. A stock we work with has already received tentative approval from the SEC for their bitcoin-funded business and they are registered in the US.
Additionally, from what I can tell , investors aren't actually investing in 'rental starter'. They're really investing in the havelock's exchange, which then funds our HK corporation from those proceeds acting as a proxy for investment to our company. If we could somehow get certification for havelock's role in this, we then would meet SEC approval without issuance of a PPM.
Given that you've stated you're currently the sole possessor of the records of investment interest for several members, and that you're based in the US, are you currently registered as a transfer agent with the SEC, as required by 17A(c) of the Securities Exchange Act of 1934? Exclusion of US investors would not satisfy compliance with this requirement, the mere fact that you personally are based in the US and maintain these records as a service imposes this obligation. And that's just one small part of the myriad of legal problems with your investment scheme.
I understand, as of right now, it's impossible for someone of your size to have an offering and not have all of the proceeds eaten up by expenses, in reality, you probably can't even make an offering that would ever cover your expenses unless you made it only to Sophisticated Investors within the meaning of current SEC regulations. I strongly implore you to watch the development of the regulations promulgated under Title III of the JOBS act, which allow for "crowdfunded" offerings without the investor wealth and income requirements currently imposed by US Securities law. You would probably be able to do this priced in bitcoin, but unfortunately, your investors would have to be identified. The truth is, nearly every country in the world (including Panama) requires investors to be positively identified by at least some counter-party to the transaction. The current structure is likely illegal under Panamanian law, and your operation is clearly unlawful under current US law, regardless of whether you make offerings to US citizens or not. You're free to read the Securities Act of 1933 as amended and the Securities Exchange Act of 1934 as amended and confirm that it does not have a requirement that investors must be US based in order to fall under the provisions. All that is required is that the transaction in some way touch the US (that would be you being the ultimate beneficiary) and involve interstate or international commerce (using your internet connection from within the US satisfies both, though you'd only need one).
Look into Title III of the JOBS act, try to make this legitimate when those regulations are finalized. I'd hate to see you shut down and bring more bad press to bitcoin.