Special days that gives interest to whales have bigger affects on bitcoin than just a simple Tuesday, hence when you see moves that are going really high in a day or really low in a day than know that it must be some special day for bitcoin.
Yeah the main problem is whales which do not allow small investors to grow up and make some money from bitcoin investment. Due to these whales small investors seldom lose their investments and now they are dishearten to put their money in bitcoin. Obviously when there is no investment cap and no or very low demand, the price will go down.