1/2 no limit game, nut flush

In a baby no limit game (1/2 blinds), I was the big blind with A,4 suited in hearts.
Three players limited, the next player made it $10, two players cold-called, the small blind folded, and it was on me.
I opted to call the raise and see the flop. I knew if an ace fell, I'd be in trouble, but liked the idea of taking this hand against a large field (even out of position). The odds against flopping a four flush are 6 to 1 against, so as long as no one re-raised, I was getting the right price to call along. Factor in the chance that I might flop two pair or that two 4s might come on the flop, and it was an easy call. If the action was re-raised, it's also an easy hand to release in that spot.
The limpers all called, and seven of us took the flop ($70 in the pot).
The flop came King high, with two hearts. I checked to the field, and it checked around. I was prepared to call a reasonable bet with my nut flush draw and overpair, but was happy to take the free card.
The turn was the seven of hearts, making my flush (no straight flush possible).
I checked, the next player bet $50, and everyone folded to me.
I raised $50, and he called.
The river was the queen of diamonds, I bet $100, he called, and I took down the pot.
Nothing spectacular. I made the nut flush and got paid off. I'm a little surprised he called the river (I tried to 'sell' my hand for maximum value, but given the way I played the hand, I figured he made me for the nut flush).
I could have bet the flop or bet out on the turn; I could have smooth-called the turn and check-raised the river.
But, all in all, I like how this worked out. A bet on the flop would have created a bigger pot to win, which would have been nice, but getting a free card while drawing is pretty nice, too.
So a little gamble with big result: I invested $10 pre-flop, got a free card on the flop, and raked in a $470 pot (for a $260 profit).