Personally, I have tried developing my own model, specifically for NASCAR head to head betting. It proved successful but after a year or so I realized it was a damn job it took so much work. I've never wanted an extra job, I enjoy both gambling and sports and combining them makes both things better for me.
So whilst I agree that it's not worth spending the time on building and maintaining a good model, unless you want a second job or need to make gambling into a reliable income or just like that sort of challenge, it definitely can be done.
So whilst I agree that it's not worth spending the time on building and maintaining a good model, unless you want a second job or need to make gambling into a reliable income or just like that sort of challenge, it definitely can be done.