[winders]

No, not a dick move.

Why would he wait to hear from you if someone came along and said they wanted it? Him responding to you is not you responding to him.

Think about it.

You post a for sale ad for your car. Someone posts a wanted ad for a car just like yours. You call the guy and leave a message. Some other guy calls you up with cash in hand to buy your car. What are you going to do? Turn down the cash in hand offer because you called the guy with the car wanted ad? Not bloody likely!!