The reason for me is it gives me an idea of what percentage of my bank I can safely put on each selection. I'll take the maximum expected run of outs and then at least double it and divide it into my bank to give me an idea of percentage to risk. There's alot of tipping services that talk about risking 5-10% of your bank on each selection, which to the beginner sounds ok but to us, we know is just a disaster waiting to happen.