Originally Posted by Hate

There has to be a flaw in my math here , or you guys wouldn't be saying i'm wrong...but where is it?

Originally Posted by krimson

The pot odds help you decide whether it is better to call or fold. When you are considerig whether to raise or call you ignore the money already in the pot and instead look at how much you expect to get back from the extra bets that go in because of your raise. With one card to come you are about 1/5 to hit your flush, so you would need 4 others to call your raise for it to be break-even compared with calling.
What your calculation of the "6.5-1 pot odds for raising" shows is that raising is better than folding. But calling is even better.

Originally Posted by Demiparadigm

^This is a great explanation.^

You call/fold depending on the odds laid to you by the pot. You are getting 9 to 1 on a 4 to 1 shot, so you are clearly not folding.

You bet/raise based only on the equity you have on that specific street. (including fold equity)
Since you are not getting your opponents to fold (barring some miracle)
-and you have only about 20% equity (more if your overcards are good)
-but you are putting in 33% of the money (on the turn)
=>a call is better than a raise.