There's a little more to this. First, I know of no overall equation that defines how often a player can be ahead when discussing individual VP sessions. There's many different games, and multiple ways to play each game.
However, for an article I did in Gaming Today I did take a look at how often (session-wise) a player is ahead minimum 5 credits playing BP in a 6-level progression with $10,000 ($1/$2/$5/$10/$25/$100). It came out to between 95%-96% of the sessions. I played a lot of sessions but can't remember the number. I also made money on it, but not anything earth-shaking.
I also don't know a thing about how table games would fare. But I caution: this guy Mdawg wouldn't be posting pictures of money, a rolex, markers etc. and blabbing about winning every single time, Hawaii trips, a skinny wife, lifting weights, being some high-powered "LA businessman" and how many comps he gets ALL THIS TIME CURIOUSLY WITHOUT PICTURES if he weren't seriously lacking in the self-confidence that SHOULD come with such claims if they were anything close to being true.
We're being punked by a doofus.