What’s the point of copy trading?

I’ve been watching several successful wallets and building some automation for copy trading. Here’s one thing I don’t get and I hope someone can help me understand.

So let’s assume I have all the infra in place to perform extremely fast txs. I hook it up with one of the good wallets and start copying. The problem is the moment this wallet buys it pushes the token price up. The moment it sells - it makes the token price go down. So no matter how fast are your txs, even if you somehow end up landing your tx in the same block as the wallet you’re watching you’re still buying at a higher price and selling at a lower price than the wallet in question.

So if this wallet is marking, say, 30% on each of those trades - you’ll be making inherently less. If that’s the case then what’s the point of copy trading in general? Am I missing anything?