If you hold a million Bitcoins and want to get rich you will not crash the market time and time again that would be very unwise, like destroying your own wealth.
Of course not. You would crash it only at times when you think it's inevitably going to crash outside your control anyway, so you're not really adding any risk that's not already there.
And the higher the price the less coins you will have to sell, so crashing the market and keeping the price down is stupid unless thats what you want.
But it's smart if you think that someone else (or many other someone elses) is about to do the same thing and beat you to the punch, and you'd rather make sure you're first in line to capture the profit.
Ofcourse I can imagine one of these early adopters need lots of money, they expected to get rich by now and took a huge loan they have to repay it.
Maybe he have been trying to postponed a sell for a year expecting price to be $50 and now really have to pay some bills no matter what.
One-in-the-hand, two-in-the-bush logic also applies. Someone who has worked at a regular job all his life is unexpectedly faced with the following decision: become a millionaire today for sure, or possibly become a multi-millionaire some time much later. Many people will readily admit they would take the first because it is definite, especially in a high-volatility environment like this.
Or someone trying to crash the market to create panic, by up as many as possible, than sell to himself to make the price rise.
But in that case, you can join that ride unless you panic to.
This is what I suspected when I saw a huge wall of asks appear. Though I don't think it would be very feasible to sell to oneself to make the price rise - one would have to clear out all the asks on the order book in the process, something that can be accomplished simply by buying the usual way without selling to oneself.