On the other hand, maybe it really was someone who wanted to acquire that much monero with no slippage. Who knows? 
In other news, I think my comments earlier were misconstrued. Monero is literally the best money on the planet. So any other financial moves you do, wherein you hope to profit, should ideally end up with you holding more Monero than you did before. You could try to use your financial moves to acquire more USD or Bitcoin, but these are inferior forms of money. The fact that XMR is not especially popular yet doesn't detract from its superiority.
The goal of any financial game is to gain more money, and make moves that allow you to gain more money than you had before. This is why I said every move needs to be calculated in how it could impact your Monero holdings - up until a reasonable individual limit of 200k to 400k Monero, more is always better (especially at these early stages). At this point is seems silly to try to chase more USD; I prefer to chase assets with more growth potential.
In other news, I think my comments earlier were misconstrued. Monero is literally the best money on the planet. So any other financial moves you do, wherein you hope to profit, should ideally end up with you holding more Monero than you did before. You could try to use your financial moves to acquire more USD or Bitcoin, but these are inferior forms of money. The fact that XMR is not especially popular yet doesn't detract from its superiority.
The goal of any financial game is to gain more money, and make moves that allow you to gain more money than you had before. This is why I said every move needs to be calculated in how it could impact your Monero holdings - up until a reasonable individual limit of 200k to 400k Monero, more is always better (especially at these early stages). At this point is seems silly to try to chase more USD; I prefer to chase assets with more growth potential.
Placing a buy wall slightly above market, creating a combination taker / maker order, is a very effective way for someone to buy a substantial position at market with minimal slippage. This is what I suspect our 40K XMR buyer just did.
Edit: The idea is accepting that your order will move the market while at the same time minimizing slippage.