So you're basically betting on people because they "look like winners" ?
Great ! i'm sure this form of betting is sustainable.
Yes is important to read facial expressions. I would say odds on the casinos is more important expert determine the odds by their skills.
After you can predict by their winning records (if they experience lost today or wins) if their confidence is right based on their winnings and how they did based on matual opponents if you dig deeper.
Isn't it what we look though for any sports betting? we look for the odds and most likely the favorite has a higher chance of winning. Of course, there is an upset that we have to consider.
I seldom bet on table tennis, but I love this sports as well.
And I do agree that some results might be rigged especially if the players involved are not professional.