RS your coin flipping has nothing to do with this statement: Rob Singer is a 6/5 favorite to win 8 out of ten sessions.
Spinning a Roulette wheel has nothing to do with that statement.
If Rob is a 6/5 favorite to win 8 out of ten why isn't he a 6/5 favorite to win 800 out of one thousand?
I'll suggest some possible answers which might help you:
1. He's likely to run out of luck the longer he plays.
2. The more he plays the older he gets and all old people make more errors.
3. His RV will break down after 200 sessions.
4. The Singer method doesn't work after ten years and it has expired.
5. 6/5 is a number pulled out of thin air because I didn't want to look like a fool if Rob does win.