There are two ways of winning a pot:

1) Outbet your opponent
2) Win at showdown

If one chooses to only call bets while on draws, the villain will bet out the draw and eliminate odds - eliminating option #2.

To maximize winning percentage, play for both. Start by trying to outbet your opponent(s). If this doesn't work, maybe you have hit your draw.

*NOTE: This is not something I reccommend with 9 people to see a flop, only something I like doing with 3 or less.*

Let's say there are 4 people including yourself to a flop. You flop a nut flush draw. From here, you are 36% to win by showdown. Let's assume for arguments sake that you can outbet your opponent 25% of the time. This means that you will rely on a showdown 75% of the time. 36% of these showdowns you will win. Leaving us with a 52% pot winning rate. 27% Of the pots won will be large, quite large due to the "TPTK" betting style you had been portraying before your nut flush came to fruition.

With this style I have found that the pots won will be either:
1) Very large
2) Very Small

Pots lost with this style I have found to have been:
1) medium

The reason for this 'medium' loss is because the deciding factor on whether or not to bet on the river when you have no nut flush, is your read on your opponent(s). Generally, if you haven't won the pot by the flop or the turn, villain(s) is not going to be pushed aside by the river - unless they were drawing too. If you think they have stuck by ANY pair throughout your betting, position yourself with check/fold mode and submit to the 48% loss column.

In summary, I like to make two large bets into a pot when I have the nut flush draw on the flop. Bet out all other draws, middle pairs, small pairs. Check/Fold mode once no made hand comes on the river, this will eliminate any large lost pots. Betting this way is also a pattern that is not generally recognized by the majority of players as something that should be preached. I think it's a great way to disguise your hand and allow you to play more post flop very aggressively.

The way I see it, I'd rather win 52% of the pots I have a draw within, rather than calling all sizes of bets and winning 36%.