Rather than ROI or POT look at return for investment and effort. You are restricted by what your bot can or can not do. Effort consists of reading a post that says it works. Doing some calculations that say it works (My original methods were too too cocky) Doing more research that says it works but some parts don't. Tweaking it accordingly within the parameters of the bot. Effort consists of loading the bot each day and pressing start. Thats it. Betfair posts its results and once I get more proficient at excel I will break it down further. Meanwhile it is 5 minutes per day and the best $2000 I have ever invested. If I started to drop maidens (they produce as much per annum but very volatile) or sort out the races then the effort would increase manyfold. I believe you have to live this life. I have more to do than turning over dozens of races to be in a position that you may or may not be better off. I am happy with my results.