Just now, I was browsing on-chain records and saw a swap with two transactions in the same direction sandwiched before and after it, so familiar I can't be more familiar... To put it simply, you think you're "seizing the opportunity," but you might actually be paying someone else's tuition. Sandwiching isn't mystical; wallet movements can be seen at a glance: too much slippage, using market orders, chasing hot trends—basically writing yourself into someone else's profit sheet.

Arbitrage is the same; often what you see as a "price difference" is just others moving faster, cleaner routing, more daring gas fees; by the time you click confirm, the opportunity has already turned into fees. Recently, with meme coins and celebrity shoutouts shifting attention, beginners are most likely to get itchy and take the last shot. Those dense small trades on-chain make my scalp tingle... Anyway, my approach is just two words: limit orders, chase less. If you really want to go all-in, consider it as buying a lottery ticket—don't pretend you're doing quantitative trading.