do they ever lay down a better hand?

[joseki]

I've read it on here many times, and had it recently reiterated by a strong player, that betting 4-flush boards is nearly always correct. Theoretically this makes some sense, but I see people calling all the time with all kinds of trash. I suspect it may be too well known at this point to be effective in these online games. Anyone have a contrary opinion?

SB is a maniac and I expect him to raise any two preflop.

Party Poker 10.00/20.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is BB with 7[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">SB raises</font>, Hero calls.

Flop: (4.00 SB) 8[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls.

Turn: (3.00 BB) 7[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, SB calls.

Planning to check behind unless 7 or 9 hits.

River: (7.00 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, SB calls.

Final Pot: 9.00 BB.