Cunicula,
I walked through your latest example of how BitBTC could in theory become under collateralized. I want to address this because it was a solid use case that has not been addressed by any of our white papers directly.
1) It is theoretically possible for your scenario to occur, and in such a scenario everyone who was Short BitBTC would be entirely wiped out and everyone who was long BitBTC would end up with twice as many BitShares as they started with (assuming they sold). It is even possible for the result of this catastrophic loss of value in BitShares to result in BitBTC being on the books without any corresponding short positions backing it up. Such an event would be terrible for those long BitShares, even worse for those Short BitBTC... but those who are impacted the least would be those who are Long BitBTC... they doubled their BitShare holdings.
2) This market does not eliminate all risk, it merely transfers a large percentage of ordinary risk from the longs to the shorts. It is impossible to eliminate all risk even with traditional financial markets. For example, a US treasury is not a 'risk free' investment, the interest rate fluctuates, the dollar can be debased, and the government could default or be taken over. You do not consider US treasuries to be a Ponzi or a scam despite the fact that they pay the returns with the investors own tax money or via inflation. So, if even US treasuries are not 'risk free' then your argument against BitShares is a logical fallacy because you are holding them to an impossible standard and pointing to any risk at all as signs of a scam.
3) The situation you present is very unlikely to occur for the following reasons:
a) No savvy investor would short BitBTC against BitShares after a major run up in the market because they know BitShares behave like Bitcoin. As a result, savvy investors would sell their BitShares and buy BitBTC so that they could make money when the price corrects. This counter-market force would actually fend off Bitcoin style price volatility. Because selling BitBTC is cheaper than shorting it, very few if any new BitBTC would be issued at the market peak and most trades would occur as trades in long positions.
b) If the BitShare price is heading to the moon, then most people would be swapping out of BitBTC and buying BitShares. This will reduce the demand for the creation of new BitBTC.
4) Assuming the event was only a case of extreme short-term volatility then anyone who held their BitBTC through the correction and allowed the market to clear would find that once again their BitBTC would recover near parity.
5) In the event that BitShares become worthless, clearly BitAssets are worthless and all parties accept this risk.
I would like to make one final statement regarding your claim about miners not having 'authority' to perform a margin call. This would be like claiming that your stock broker doesn't have authority to perform a margin call. When you entered into the short position, the network rules stated the terms under which a margin call could be executed and all miners must follow those rules or their block will not be confirmed by the network. So, if you do not want to risk a margin call, don't enter a short position. You can buy BitShares or your can Buy BitBTC... but you cannot short BitBTC. Allowing someone to Short BitBTC and then calling foul when their margin is called would be like allowing someone to mortgage their house and then crying foul when the loan is called when the value of the house falls. You are using borrowed money, you have no right to keep your short position without sufficient collateral.
Who profits from the ponzi? Anyone who mined bitshares and got out before the bubble burst.
Thank you for clarifying your position, your definition of a ponzi applies to every crypto-currency and every corporation that issues stock. If this is what you think then there is no point in arguing.
On the other hand it appears that 100% of your claims could be resolved provided we educate all parties to as many risks as we can think of and in this case you have been most helpful in identifying areas where our users must understand the risks.
In conclusion, BitShares allows users to mitigate to a large extent the vast majority of risks associated with crypto-currency price volatility. However, every holder of BitX is only ever guaranteed to receive the collateral backing their position (2x as many BitShares) in the most extreme cases. If you are willing to accept that risk, then you can buy BitBTC and earn dividends for taking that risk. If you are not willing to accept that risk then keep your BTC and forfeit the opportunity cost of lost dividends. Either way, you as the user of the system are responsible for assessing the risk/reward of using the system.
It is my belief that there is enough utility and corrective market forces to both justify the value of BitShares as non-0 and to prevent the most extreme market events from occurring. It is also my belief that because BitShares are deflationary, income-producing assets they will on-average rise in value just like Bitcoin and therefore any extreme movements are only temporary in nature.
So I am more than happy to put as much information in the hands of individuals to make educated investment decisions.
If anyone has any questions I am more than happy to address the concerns via Skype: macman2k.