Bill, thanks for your input.
I use a proprietary spreadsheet and look for the positive expectancy races which exhibit unique factors for the type of race that it is.
I don't look at the odds and I don't use pacelines.

A model more or less with a lot of factors.
The big prices come when you can sustain your bankroll with the lower price horses. the bottom line is ROI, nothing else matters.
I will not bet 2 horses unless it is impossible to split contenders.