The price is still the same, but your position is gone,

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.