Don't think in terms of there being one tiger that stops as soon as it gets something to eat. The market's more like a sea full of countless sharks, where all the sharks have to survive by eating other sharks.

You're not wrong to think that, if there's any way to consistently make money by trading, it's by exploiting inefficiencies in the market. But remember that those inefficiencies come from people. Are you confident enough in your skills, your education and your resources to be sure that you'll be one of the ones finding and exploiting inefficiencies, rather than one of the ones who's creating inefficiencies for others to find and exploit?