I raise A9s on BB with 3 limpers. Correct?

[deception5]

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Would no one go for a check-raise on the flop? Betting out gives everyone 11:1 to call. Chances are you are ahead, but you are vulnerable to at least 4 overcards and spades on the turn, so isn't it worth the risk of having it checked through?

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It's not usually a good plan to raise preflop from the big blind and check on a harmless flop. This is a value bet and we'd like to protect our hand against things like K8 or even QJ. A BB raise shows extreme strength and a player with QJ will likely believe they have less than 6 outs (which they would if we had AQ/AJ/KQ/KJ/AA-JJ/99 which are all in our range) and will often fold especially when not closing the action.