How is 10% down going to make me rich?.. mancity Vs Southampton get then odds

I'm asking seriously as I don't understand

Mancity Vs Southampton can fetch 1.10 odds and is very likely to happen

I see many stocks down 10% and people say buying the dip to make you rich as if it's quickly going to rebound so you make 10%

Why is this seem more safe then mancity, I personally see our times so fragile it could crash much more then this so it's pretty risky

I assume people will point to outliers ie Nvidia who are 38% down from ath, then my argument would be there was well overvalued earnings to pe, betting in that is risky

Can someone explain why I'm wrong