Bitcoin traders will end up making less or no profit, or run at loss.
There is no single approach to wealth, so I will not agree with you that Bitcoin traders will make less profit or run at loss. Trading under any guise can be very profitable when the skill is mastered and the right approach followed. I have seen some millionaires traders who made fortune trading the forex market as well as Bitcoin through futures trading that is common in many exchanges. Some of them even have a very large quantity of Bitcoin they are holding for the future and that money was made from trading. So, they make profit from trading, use same to buy Bitcoin to save for the future. I'm not making assumptions, I know many of those guys down to their houses.
I don't see trading as a means to get wealthy because traders are only after peanut that they will make within a short period of time and that wouldn't add any much increase to their bitcoin portfolio. I haven't seen a wealthy man who became rich overnight. A wealthy man will take out time to nurse, monitor and grow his investment for a long time before he will become wealthy because he knows that it is too early to take profit.
So I don't see how trading can help one increase his bitcoin portfolio in the long run than some who is using only DCA strategy to increase his bitcoin investment portfolio. Well it is one choice to do whatever he likes with his bitcoin but it will be not be a wise decision to advise anyone to increase his bitcoin portfolio through trading. You should also note that a trader is not an investor, because he believes in quick profit and this an unhealthy strategy towards investing.
A professional trader can run at big loss in just one trade, but a newbie, who is into bitcoin investment that understand how to buy bitcoin and hodli with his regular DCA will never run at loss, if he intends to hodli for 4-10yrs timeline.