TO BET OR NOT TO BET? 15-30 LIMIT HAND

[Vince Lepore]

15-30 in the cutoff with Ak spades with 6 other opponents. I raised all six called. Flop was QJ2 one spade. It was checked to me one off button and i bet hoping to get a free card on turn and the fact that my hand could be the best hand. The reason i am posting this is after telling this hand to a friend of mine who plays for a living said it was an ill advised bet. I told him his play was weak(and scard poker) to not bet cause his reasoning is he couldnt have the best hand most of the time and didnt want to be charged more than necessary to draw. He then said there was chance to get free card but it was on flop when only one left to act behind. And trying for free card on turn wouldnt work often enough to bet into 6 others on a QJ2 flop which is a flop that will usually hit alot of opponents. And could get checkraised or worse very easily and get caught in a whipsaw on flop when i could have easily checked the flop. Which is correct play?