This guy states here that he got 5% ROI stable for last 5 weeks. And won about 220000€. 
Looks like total crap.
It's clear that you can't get value from every 10th match in-play without even watching it or at least thoroughly examine squads using brain. Even more so you can't get stable upstream every single day.
Number of different unpredictable situations in-play is enormous. You can't take that into consideration, your program is unaware about it.
Anyway how much ROI can you really achieve in-play?
Looks like total crap.
It's clear that you can't get value from every 10th match in-play without even watching it or at least thoroughly examine squads using brain. Even more so you can't get stable upstream every single day.
Number of different unpredictable situations in-play is enormous. You can't take that into consideration, your program is unaware about it.
Anyway how much ROI can you really achieve in-play?