People are still buying at $727, though all indications show that value is falling, headed back to around $350... why would they NOT buy at 50% to 25% off the last known high-value? They don't have to buy all of them, just mine.
Remember, every coin sold by someone, was purchased by someone-else.
Well, if no higher prices later... then no point in holding then, is there. Thus, selling.
Everyone assumes higher prices later, which, eventually will come from most lows. If not on an exchange, then off the exchange. If not now, then in a year from now, or 100. It is inevitable that higher prices will come, eventually. It is never a loss unless you accept less, and cash-out permanently, or everyone throws bitcoin wallets away.
When BTC falls, and if it does not rise, you use your BTC to buy any rising alt-coin. So it is never a loss, even when it seems like one. Remember, we are buying others prior debt, present debt, and future debt, with a dollar that is constantly falling in value. (Miners and power and time.)
We have to assume... or convince others to assume. Everything is speculation. You "assume" that when you put money in the bank, that you can get it out. (Only about 15% of those with money in the bank can actually do that. After that, you get another "note", a voucher for future withdraws. More virtual-credit, for the virtual-credit we all call a dollar or "bank note". Until they can print more, or borrow it from China. So ironic!)
You also assume that when you wake, everything on the dollar-menu will be a dollar. (Well, now it is "A dollar or more", as the dollar continues to lose value. But I anticipated that fall, and assumed the price would rise as my dollar value fell, and it did. But that is like guessing that a quarter will land on heads or tails... eventually it will land on its side, and you lose.)
This is why I was interested in seeing charts for the above stated situations. Loss or gain, but at the moment, the last five years have been mostly gains. My biggest fear is that this turns into something like an actual dollar, which would just result in yearly loss after loss after loss... but predictable and steady loss.
If the difficulty gets any higher, they are going to have to build more nuclear plants to power and cool the super-computers to process the transactions and mine for coins! That alone will add value to the coin! Not to mention the cost to reverse global-warming from trillions of miners! Paid for in BTC.
But that is speculation too. We might have cheaper stuff to mine with, that is more efficient and cooler, or hit an ice-age again. It is due... has been over 400 years since the last mini-ice-age, one is due again. (Happens in periods of global-warming, which is a natural planetary occurrence.)