Rebates & Match Plays
The Mayor is correct. By losing 90% of your losing bets, and winning 100% of your winning ones, or 150% if you get a BJ, you should be ahead by 53% of 10% - the house edge, say around a 4.8% edge.
With the 100d/200b match play, we lose 100 or win 300, or 450.
L 100 x 53 = -5,300
W 300 x 47 = 14,100
8,800 profit over betting 10,000
About an 88% advantage.