In my opponent's defense, I had been doing my share of bet-folding prior to this:
Party Poker 2/4 Hold'em (7 handed)
converter
Preflop: Hero is UTG with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises</font>, <font color="#666666">
4 folds</font>, SB calls, BB calls.
Flop: (6 SB) K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets</font>, SB calls, BB folds.
Turn: (4 BB) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, SB calls.
River: (6 BB) K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">SB raises</font>, <font color="#CC3333">Hero 3-bets</font>, SB calls.
Final Pot: 12 BB
Results in white below: <font color="#FFFFFF">
SB has 5c 5d (full house, kings full of nines).
Hero has Ah Kd (four of a kind, kings).
Outcome: Hero wins 12 BB. </font>
. . . So maybe I picked up a couple of bets on this hand with those previous folds, if my opponent had been paying attention. But I also think this hand shows the dangers of the bet-fold line, on Party 2/4.
Edit: (I guess maybe my opponent thought it was an obviously split pot that he might be able to buy.)