I wouldn't ask why they added the money animation thingy instead of repairing bugs, I would ask why the animation shows the money going to girls instead to our wallet, when its money we "get from them". Makes kinda no sense.

As a side note, do people really play normal pachinko so much to whine that 10 at once is not enough? Also whats that 35 seconds delay between selling things OP said about? I can mass spam sell and sell hundreds of things in that 35 seconds time frame. So instead of asking for "sell all" OP should check his game/pc/browser cause that delay thingy must be a bug.