I think it's closer to 5-7 percent. Not all play every sport. I know two 'groups' out here that kill it, MLB and CBB.
Krack is including the guys at the window with the cap turned backwards. I'm talking serious people that manipulate overnights and pound their sport first thing in the morning. The problem of course like always is avoiding being profiled and getting cut.
There were a lot of sharp guys I met in Vegas...you could tell they grind out a profit. How they stayed under the radar? They never used a app.
I always take Krack and Fezzik's puffing with a grain of salt. The underlying motive is selling.
We're one of the very few, btw I'm at KrackWins.com
Which reminds me of the Stardust contest and Big Al McMordie, tout. Fezzik kept calling him out on radio for constantly mentioning BigAl.com....my, how the tide has turned.