Your argument is not completely dismissed, investing in bitcoin at this time is almost certain to make you profitable.
But I would say that in the currently dips market, you may not get the opportunity to buy at this sinking price in the future - so you buy and hold Bitcoin. This HOLD bitcoin will make you much more profitable - long term investment. A bull run could take bitcoin to $100k soon. So you try to have a lot of profit instead of expecting small profit.