These days, looking at on-chain transactions, sandwiches and arbitrage are truly everywhere.

You think you've scored a bargain, but when slippage widens, others have already taken a first bite and then added a second, with fees and spreads all bundled away by them...
To put it simply, many "opportunities" are actually you providing liquidity for others, while casually paying tuition.

Now I will first glance before placing an order: whether the pool is deep, whether there have been a series of failed trades or quick retries in the past few minutes—if so, I’ll hold off for a bit, preferring to do fewer trades.
Anyway, you can't make that kind of money.

By the way, there's a lot of noise about NFT royalties, but I see that secondary sales are lively, and the truly steady income often isn't from creators or retail investors, but from that middle layer of "friction costs" being harvested.
Calm down, the market is never short of people confirming for you.