After reading some Roy Rounder stuff, I got thinking about hand V hand stuff and I came up with the following (most likely easily answered) discussion, but as a stil relative noob I need a little help so here goes........

Hero has o/e straight draw on the flop against Villain, who Hero has put villain on flush draw. So Hero is 14% to hit on turn and 13% on river and 24% for Turn and River. Hero has 6 outs after discounting. Villain is 19% for Turn and 20% on River and 35% for both with 9 outs.
Turn and River:
Hero: 24% or 3 to 1
Villan:35% or 2 to 1

I do realise this is very general but would it be correct for Villain to pay more than 3 to 1 to continue as he has a higher chance of catching the winning hand?

Also, what if hero makes his straight on the flop? As the flush beats him, does that mean Hero's hand is unable to be improved on Turn and River thus making Villain's flush draw more attractive to chase?

Possibly a little convoluted and misdirected but if you can make some sense out of this I really like to know how my thinking is/is not working.

Thanks