Gaining an edge from other players
More ways to gain an edge from other players:
You can by a player's 19 vs. 10 up (8-7 favorite), since most players suffer from "10 in the hole phobia".
You can even pay a small bonus to the player as an incentive, such as $26 for a $25 nineteen, or $105 for a $100 nineteen.
You can get somebody to take one of your split cards that looks like an advantage but isn't - such as 7/7 vs. 2 up (5-4 underdog).
You can jump in on several improper double downs which are improper only because they win less money than doubling, but still win money, such as with 11 vs. an Ace up, 9 vs. a 7 up, 8 vs. a 6 up, etc.
You can pay a small bonus on a player's blackjack against an Ace, such as $101 for a $100 blackjack, but that could draw unwanted attention for two reasons: A) showing that you're aware even money is a bad bet; 2) horning in on the house's action.