Traders who are satisfied with getting more than 15% profit in a week?
That's an awesome short-term trade, really, we can't blame them.
1st reply = correct answer.
There's still hope for this forum
If this were true they wouldn't dump it all at once but sell gradually.
Why? Many traders have profit targets, but also like let a profitable position ride as long as possible. Someone has to take the first step, (i.e. take the actual profit), which triggers a) others to take profit as well (their long position won't ride much longer), and b) pure momentum traders.
Slippage is the reason. Of course this are likely many people as you say, but if this is "someone" dumping 2.5k BTC he's not acting rationally.
I really don't know what makes you say that.
I don't know your volume, but did you ever trade (on, say, stamp) actively trying to avoid/minimize slippage? It's harder than you think.
If I split up my own orders, the market often "runs away" in the meantime, if I don't split them up, I incur high, but predictable slippage (I can say pretty much with certainty how high my slippage will be, on average).
Anyway, I don't see how "rational" or not factors in here at all... how is taking a 20% profit "irrational"? Because if the actor wouldn't have sold, we would be even higher? That's not a way to argue in an n-player game like a market.
EDIT: re-reading your post, I guess "irrational" refers to the dumping part, instead of splitting it up. Consider for a moment however that a dump incurs higher slippage, but might trigger a stronger momentum reaction, so again: it's not necessarily "irrational", just a gamble, if you want.
