But, when people say they "got in" and "sold at price X (which always seems to be at the top of the market)" my question is: How much did you put in originally?
If you bought thousands of dollars worth of bitcoins and quintupled your money, you did a good gamble (assuming you were able to get your funds to settle and convert back into "worthless" FRN's that you could then pull out of the market and use to buy something in the real world.).
But chances are, few did that. Most purchased about $200 worth or so of Bitcoins. Whether you made a profit or not is pretty irrelevant. If you expose yourself to a high probability of loss, in the long run, you won't have a long run. That's why casinos don't care if you pulled out the $100,000 jackpot on a slot machine one day, because they know, in the long run, they'll make money.
It's not an "investment" that you did...it's "speculation". You speculated "correctly", maybe, but there is nothing "smart" about putting money into a digital currency that has proven to have none of the features everyone touted it to have, just as someone who put in a dollar and pulled the arm on the slot machine who ended up winning $100,000 cannot be called a "smart" gambler.
There's no such thing as a "smart" gambler. No such thing as a "smart" speculator. If you're making a bet that a majority of the time will lose, or exposes you to high risk, then that can't be passed off an investing, nor as being "smart".