When is the lone K
going to lose a lot of money?
- On the flop when he has two streets to draw
- On the turn, with his odds cut in half
- On the river, having missed his flush
- On the river, having made his flush when you jammed the flop and he assumes you had two pair or a set because of your flop action (and his hopes).
Notice the 3 is a likely case and he never gets action? Two isn't getting money shoveled in. 4 requires 1.
Generally, people drawing dead don't pay you off when they miss.