Why can't retail investors speculate on stock prices themselves?

This idea is not realistic. Generally, the dealer has to control more than 60-70% of the tradable shares to operate the stock. What a huge sum of money, there should be at least several hundred million. This is still a small-cap stock. If it is a big market, there will be more. There should be tens of thousands of retail investors to collect so much money. If the price goes up, can you guarantee that these United retail investors will not fall into the bag? After all, the confidence and determination of some retail investors can't compare with the bookmakers. If they drop a little, they will rush out. Therefore, when the bookmakers want a stock price to rise, they will build several hills (that is, they will fall after rising, but one hill is higher than the other) to let those determined retail investors run out. Can these tens of thousands of retail investors admit it? If retail investors lose a little, they will definitely not take care of everyone, and their own interests are the first. Bankers don't have to worry about this problem, because the funds are in his hands or in the hands of an institution, and there is a unified allocation.

The above is my personal opinion, I don't know if it's right.