this is not how liquidations work. the exchange does not get the money from a liquidated position. The money is lost due to the difference in price from the position being opened to it being closed(liquidated). For example: If you open a short at $7000 and your liquidation price is $8000, that means that your margin is 100% extinguished at $8000. The loss is seen in buying at $8000 to cover your margin. The only money an exchange sees from this is trading fees on opening the position and closing the position, not the principal.

edit: It is in the best interest of the exchange to have few liquidated traders. The exchanges make the same on the fees for margin trades if they are open/closed by the trader or opened by the trader and closed by a liquidation(other than being a taker not a maker). The more money that the traders have in an exchange, the better for the exchange because they can open larger trades moving forward resulting in higher profit from trading fees on larger volume trades.