Why don't donks try to extract any value?

PokerStars Game #5010008931: Hold'em No Limit ($0.10/$0.25) - 2006/05/21 - 18:39:47 (ET)
Table 'Polyxena' 6-max Seat #5 is the button
Seat 1: TeddyKJB100 ($10 in chips)
Seat 2: johnnyBuz ($27.65 in chips)
Seat 3: Diamond_D23 ($17.45 in chips)
Seat 4: frostyc ($26.60 in chips)
Seat 5: woxwox11 ($24.10 in chips)
Seat 6: HOASTY ($25 in chips)
HOASTY: posts small blind $0.10
TeddyKJB100: posts big blind $0.25
*** HOLE CARDS ***
Dealt to johnnyBuz [Qs Jd]
johnnyBuz: calls $0.25
Diamond_D23: folds
frostyc: folds
woxwox11: folds
HOASTY: calls $0.15
TeddyKJB100: checks
*** FLOP *** [7d Ts Tc]
HOASTY: checks
TeddyKJB100: bets $0.25
johnnyBuz: calls $0.25
HOASTY: folds
*** TURN *** [7d Ts Tc] [Kd]
TeddyKJB100: bets $0.50
johnnyBuz: calls $0.50
*** RIVER *** [7d Ts Tc Kd] [Qd]
TeddyKJB100: bets $1.25
johnnyBuz: calls $1.25
*** SHOW DOWN ***
TeddyKJB100: shows [2h Td] (three of a kind, Tens)
johnnyBuz: mucks hand
TeddyKJB100 collected $4.55 from pot
*** SUMMARY ***
Total pot $4.75 | Rake $0.20
Board [7d Ts Tc Kd Qd]
Seat 1: TeddyKJB100 (big blind) showed [2h Td] and won ($4.55) with three of a kind, Tens
Seat 2: johnnyBuz mucked [Qs Jd]
Seat 3: Diamond_D23 folded before Flop (didn't bet)
Seat 4: frostyc folded before Flop (didn't bet)
Seat 5: woxwox11 (button) folded before Flop (didn't bet)
Seat 6: HOASTY (small blind) folded on the Flop