On-chain, this "cutting in line" system, to put it simply, affects two main groups of people: one are retail investors who think that clicking once will allow them to transact in order, and the other are liquidity players placing orders near the floor / sweeping the order book (including people like me who watch the order wall). It's not to say that someone is necessarily getting badly scammed, but the fairness you perceive in matching is often just psychological comfort.

The reason is simple: for the same buy or sell, after the order sequence has been manipulated, the transaction price, the counterparty, and even whether you can complete the trade all change. Especially in NFT floors with thin liquidity, if someone jumps the gun ahead, your order can shift from "buying cheap" to "raising prices for others," or simply get caught in the middle as a toll. Recently, the collapse rhythm caused by inflation and studio-driven pump-and-dump in chain games also resembles this; if the rules are slightly biased, the spiral ultimately results in those who take it seriously ending up unlucky... Anyway, I now prefer to chase fewer trades rather than be the one who gets sorted out and educated by the system.