@Karen Margrave , you are correct that it is not like real estate. Real estate can yield a monthly return without appreciation, it has much more stable returns, and much more of it can also be built tomorrow. There are a plethora of other differences. I would say it's closer to a very unproven gold. As @Michael Heisterkamp was pointing out, it has a finite supply (no more than 21 million can ever be in circulation, like gold is hard to mine..). It is not accepted for many typical transactions (just like gold). There is no "midas touch", alchemy, or central bank that can expand the supply of either of them infinitely.
The fact that it is decentralized and not "backed" (aka controlled by) a central authority is viewed by most users as one of its strengths - not one of its weaknesses. Gold is not backed by any government either, and the days when the dollar was "backed" and convertible to gold is LONG gone. It is traded freely on the open market for anyone who would like to buy it in a private transaction. It only has value because of its limited supply and thousands of years as a use of store of value. Besides the small amount used in electronics, its next best usefulness is hanging it around your neck to look shiny..
Bitcoin is different in that it is intangible. But when gold's next best use it to look shiny, it's hard to hang my hat on its tangibility as a necessity to its value. A share of an ETF for gold is just as good as gold in many ways, and you can neither touch it nor see it. It has lower holding costs than physical gold, lower transaction costs to buy and sell, and can be exchanged to USD and transferred around the world in any currency quickly. Much like BitCoin. The biggest difference? Bitcoin has only been around for a few years vs thousands, so is highly untested in its durability of people's views as a store of value, and perhaps more often in the future as a medium of exchange... You are right. It does depend on people believing in it as a store of value.. And that varies wildly from day to day. I'm not advocating anyone to purchase it unless they are gambling, but it's interesting and just trying to explain people's perspective on it.
Greenspan said almost the exact thing you said the other day regarding it needing to be "backed" by a govt, so what you're saying is not off the mark from a highly (formerly?) respected economist.. But it's exactly why so many people want it..
@Michaela G. , you are right individuals can still trade it online. But Chinese financial institutions and businesses aren't supposed to quote in bitcoin. Thus the news with the Baidu subsidiary. The govt is weary of banks getting into trouble dealing with wild investments, and there is some issue with Chinese trying to get out of the yuan w/o controls from the government's perspective I think.. But great discussion. I had to give you a big vote for this one, as I am obviously beyond interested in the Bitcoin / cryptocurrency phenomenon.