Orders will be partially accomplished, with and algorithm, trading bots will adjust to sell in a way for maxing gains. I fake the market to stay at the price of others markets, meanwhile i try to sell at the price without lowering too much my coins (i need to sell without being the big whale). Not all buy orders will be executed, Bank deposits to get out last days, someone will notice something, all will dont care, until they are late and wasted, it will be weeks.
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So now you don't want to sell your coins at 'funny' prices (above market rate), but just dump them without driving the prices down? You lost me here...
you do realise right now that no one knows how much real bank notes sit in btc-e, bitstamp and bitfinex bank accounts right?
you do realise that just moving 200 coins on btc-e causes peoples naive belief that the market cap of $5billion shoots up to $6 billion.. right... simply because someone ate 200 coins of sell orders (causing a $75 price wall difference($357-$450) due to most sell orders only being 0.011btc).
you do realise that last year mtgox when they had active trading, was doing in excess of 150k coin volume. and btc-e was close behind... but this year btc-e is well under 20k. bitstamp doesnt really exceed 25k. and in both cases most of that volume is internal movements of the MySQL database. not deposits and withdrawals of actual fiat.
so as the OP asks, ignoring the exchanges naive valuation of the market cap because no one can, with any sanity, truly value 13million coins on the bases of less than 200 coins moving around per hour. especially if they cant put a proper dollar value against the cap as a proper measure.
im not saying that its a flaw.. just a naive human acceptance.
i think when things like winklevoss ETF open, where they have to be transparent about the fiat reserves and bitcoin holdings. then a more accurate and healthy valuation can be found.
but right now the only transparent and direct 100% real fiat-bitcoin trade is localbitcoins.
The exchanges are shitty indicator of value, I 100% agree with that. But sadly that's the only indicator that can be used by merchants accepting bitcoins. And they need the price indicator.
Sure I can laugh at the low price, I can value BTC that I hold at say $1000 and commit not to sell below that, but the very moment I decide to buy something with bitcoins, this 'exchanges naive valuation' becomes real.
Haven't used localbitcoins yet, but don't think anyone would be willing to buy BTC from me significantly above the rate on exchanges. Correct me if I'm wrong.