It's spread out to add to the ask depth to not bi obvious. Thought that would be common sense. You don't want to wall it up and cause a panic drop, you just don't want it climbing too much. If you sell off some of the btc oh well, its still better than letting another "whale" run away with the price.
Or it could be a trader anticipating that the top is either in or near and is looking to take a short position at best possible averaging price for the coming correction?
tbh, the Ask side of the Wall on Bitfinex doesn't look any more inflated than the Bid side and since it is Bitfinex, we know that both sides of the wall are wildly inflated compared to the actual volume of trade that will be conducted on that exchange.
If sentiment is bullish and you are fearing that whales are going to bid the price up b4 you can take a position, last thing you want to be doing is fattening up the Ask wall offering them more coins at cheaper prices, which they will gladly take.