If it hits, you will feel stupid for not putting more on it.
If it loses, then it means you're better off staying with just your big bets
Why not just selectively make bets, and put big money on the ones you are REALLY confident in? Only way you make money is by hitting your big ones anyway.
You rarely see somebody hit 5 small bets and lose one big one, for example. It's almost always the opposite.