I was a 2 horse per race man for about 15yrs. Now I'm a one horse per race man. If 2 horse per race are better than 1, then why not 4? There can be only one winner [unless a dead-heat] and any other bets you have are done dough and also both selections often lose [far too often].

A race bet amount can be divided up anyway you like without being better off than single bets. It's simple maths. If punter 'A' has $20 on a horse at $5sp. and it wins, he collect $100 and make $80 profit. If Punter 'B' has $10 on the same horse and $10 on another he has also outlayed $20 but collects $50 and only makes $30 profit [not $40]. Why? Because he he has lost $10 on a losing bet in the same race [that could have been a winning bet on another race].