As I said before, you are backing the horse to win over it's next 5 starts. If there are five horses selected in a race, and they come up against eachother 5 times in a row, is the same horse going to win each time?

Not usually.

Therefore, often we will see a horse salute at overs which will more than cover the investment.
As I said there is no point judging this til the first selections have had five runs.