The reason you do this:
BB: $11.61 (46.4 bb)
Hero (MP): $45.44 (181.8 bb)
CO: $23.11 (92.4 bb)
BTN: $6.57 (26.3 bb)
SB: $26.18 (104.7 bb)
Pre-Flop: Hero is MP with 2
A
Hero raises to $1, CO folds, BTN calls $1,
SB raises to $4.25, BB folds,
Hero raises to $45.44 and is all-in, BTN folds, SB calls $21.93 and is all-in
Flop: ($53.61) Q
Q
J
(2 players, 2 are all-in)
Turn: ($53.61) 7
(2 players, 2 are all-in)
River: ($53.61) 8
(2 players, 2 are all-in)
SB shows J
J
C9's All in
equity: 32.2%
Not a huge mistake...
Is because it inspires players to do this:
MP: $22.45 (89.8 bb)
Hero (CO): $28.66 (114.6 bb)
BTN: $19.26 (77 bb)
SB: $10.46 (41.8 bb)
BB: $10 (40 bb)
UTG: $11.66 (46.6 bb)
Pre-Flop: Hero is CO with Q
9
UTG folds,
MP raises to $0.85, Hero calls $0.85, 3 folds
Flop: ($2.05) Q
4
9
(2 players)
MP bets $1.50,
Hero raises to $4.95,
MP raises to $21.60 and is all-in, Hero calls $16.65
Turn: ($45.25) 4
(2 players, 1 is all-in)
River: ($45.25) 5
(2 players, 1 is all-in)
MP shows A
K
C9's All in Equity: 95.1%
WAY AHEAD!