Just thought of it again, the pin, the dealer shouldn't be doing it for cashing out, but rather to clean up the bulls before pulling the market up, and to clean up the bears before pulling the market down, making it easier to operate. I don't know if this understanding is correct? But many times after the pin, there isn't a quick pull-up or pull-down, isn't it still allowing other bulls and bears to enter?

How does the dealer make money with pinning?

There is a question I have never understood, how does the dealer make money with pinning?
One up and one down, the price returns to its original position, isn't the chip unchanged?
Doesn't the dealer need to sell at a high volume, and have someone take over in order to cash out?
If they sell to themselves and buy from themselves, wouldn't that be meaningless?
Or is it that the dealer's chip cost is low, but that doesn't explain cashing out.
I seek clarification from the experts.